The Mikveh: The Jewish Ritual Bath, Meaning and Rules

A discreet pool, often in the basement of a building or near a synagogue, that you would never notice from the street: this is the mikveh, the ritual bath of Judaism. Wives, converts, men on the eve of certain festivals, and even new kitchen utensils are immersed in it. Is it a matter of hygiene, of symbolism, of law? This article answers from the Torah, the Mishna, the Talmud, Maimonides and the Shulchan Aruch, distinguishing what is halacha (the law that is practiced) from what belongs to spiritual reading, and then sets it all against the evidence of archaeology.

The short answer

The mikveh (in Hebrew, “gathering of water”) is a pool built according to precise rules, which holds at least forty seah of valid water (a few hundred liters) and in which one immerses oneself completely, with nothing forming a barrier between the body and the water. It is nothing like a hygienic bath: one enters it already clean, and immersion changes the status of the person, not the condition of the body. It restores ritual purity (taharah) to someone who had been in a state of impurity (tumah), it is the final step of conversion, and it prepares certain objects for a new use. Today its most widespread use is family purity (taharat ha-mishpachah), observed by married couples. The Sages also read in it a second beginning; that reading is not the law, and we will keep the two apart.

What Is a Mikveh?

The word comes from the root kavah, “to gather.” It appears from the creation onward: “And the gathering of the waters (u-lemikveh ha-mayim) He called seas” (Bereshit [Genesis] 1:10). The Torah then makes it a term of purity: “Nevertheless, a spring or a cistern, a gathering of water (mikveh mayim), shall remain pure” (Vayikra [Leviticus] 11:36): אַךְ מַעְיָן וּבוֹר מִקְוֵה־מַיִם יִהְיֶה טָהוֹר. The verse speaks first of contamination by dead animals: a spring or a cistern does not become defiled. Tradition also reads in it the rule that any “gathering of water” permits immersion, provided it can receive the whole body (Rambam, Hilchot Mikvaot 4:1, see below).

A mikveh is neither a swimming pool nor a whirlpool bath: halacha regulates its construction down to the smallest detail. The Mishna devotes an entire tractate to it, Mikvaot, which has ten chapters and belongs to the order Tohorot, that of the laws of purity. A particularity: this tractate has no Gemara in the Babylonian Talmud; the laws of the mikveh are studied there mainly through other tractates (Eruvin 4a-b, Yevamot 46a-47b, Niddah 66a-67b, Avodah Zarah 75b, which we will see). The Rambam (Maimonides) gathered these laws in his Hilchot Mikvaot, eleven chapters of the Mishneh Torah.

The first chapter of Mikvaot classifies waters “in six degrees, each above the other” (Mishna Mikvaot 1:1). At the bottom of the ladder, the water of simple pits, of less than forty seah; above it, the mikveh of forty seah, “in which one immerses and in which one immerses [others]”; at the very top, “living waters” (mayim chayim), those of a spring, in which the zav (a man with a discharge) immerses and with which the water of the red heifer is prepared (Mishna Mikvaot 1:7-8). Each situation of purity corresponds to a minimum degree of water.

What the Torah Says

The Torah does not devote a chapter to the mikveh as such; it prescribes bathing in specific cases, and it almost always uses the same formula, “and he shall bathe his flesh in water.” We meet it:

for one who has been healed of tzara’at, the ritual skin disease: he washes his garments, shaves his hair and “bathes in water” (Vayikra 14:8-9);
for the zav, who “shall bathe his flesh in living water, and he shall be pure” (Vayikra 15:13);
for a man after an emission of seed (Vayikra 15:16) and for the couple after relations (Vayikra 15:18);
for one who touches the bed of a zav (Vayikra 15:5);
for the high priest on Yom Kippur (Vayikra 16:4 and 16:24);
for the priest and for the one who burns the red heifer (Bamidbar [Numbers] 19:7-8), and for the impure person who has received the sprinkling of its ashes (Bamidbar 19:19);
for objects: “any vessel (…) shall be put into water, and it shall be impure until evening, then it shall be pure” (Vayikra 11:32).

One detail is striking: the Torah does not explicitly mention the immersion of a woman who has her period. It says only: “She shall be seven days in her state of niddah” (Vayikra 15:19), and it forbids marital relations during this period (Vayikra 18:19; Vayikra 20:18 indicates its gravity: the penalty of karet, “cutting off” from the people). The immersion of the niddah is learned from the general rule: for the Rambam, wherever the Torah says “wash the flesh” and “wash the garments” in connection with impurity, it means the immersion of the whole body in a mikveh. These rules come from the oral tradition, he specifies, but a verse serves as their model for all the impure: “It shall be put into water (…) and it shall be pure” (Vayikra 11:32; Hilchot Mikvaot 1:1-2).

A third remark, important for understanding the spirit of these laws, concerns the status of the bath. According to the Rambam, the mitzvah of immersion is not an order given to every impure person to purify himself at all costs, as one who wears a four-cornered garment must put tzitzit on it. The Torah simply teaches us that whoever wishes to purify himself does so only by water: “whoever wants to remain in his impurity and not enter the camp of the Divine Presence for a long time, he is left free to do so” (Sefer Ha-Mitzvot, positive commandment 109, citing the Sifra, Acharei Mot 5:3: “Perhaps it is a decree of the king? Scripture says: ‘and afterward he shall come into the camp,'” Vayikra 16:26; immersion is thus the condition for entering the camp, not an order to purify oneself). The Sefer Ha-Chinuch (mitzvah 175) takes up this analysis. In practice, this reasoning has a clear consequence: for anyone who wishes to live a married life, the immersion of the niddah is unavoidable, since the Torah punishes with karet relations with a woman who has not performed it (Shulchan Aruch, Yoreh De’ah 201:1).

The prophets take up this image: “I will sprinkle pure water upon you, and you shall be pure; from all your defilements and from all your idols I will purify you” (Yechezkel 36:25). Water is here a language for speaking of the renewal of a people. We will come back to this with Rabbi Akiva.

Forty Seah: The Talmud’s Reasoning

The Measure and Its Source

The Talmud establishes the measure at Eruvin 4a-b, in a discussion of what, in halacha, is “a law given to Moshe at Sinai” (halacha le-Moshe mi-Sinai) and what is written in the Torah. Rav teaches that three kinds of laws (the measures of the mitzvot, the obstacles to immersion, the partitions) are traditions transmitted at Sinai. The Gemara objects that the obstacles to immersion can already be deduced from the verse, and it connects them to Vayikra 15:16, “he shall bathe all his flesh in water,” which it reads as follows:

“‘In water’: in the water of a mikveh. ‘All his flesh’: water in which his entire body can go up; and how much is that? A cubit by a cubit, to a height of three cubits. And the Sages estimated the water of a mikveh at forty seah.”

(Eruvin 4b) — כל בשרו: מים שכל גופו עולה בהן, וכמה הן — אמה על אמה ברום שלש אמות. ושיערו חכמים מי מקוה ארבעים סאה.

The reasoning is thus twofold. The verse imposes the idea of water that can receive the whole body at once; the Sages translated this requirement into a volume: the prism of one cubit by one cubit, three cubits high, holds forty seah (Rambam, Hilchot Mikvaot 4:1, who adds that, according to the Torah, any gathering of water permits immersion provided it can receive the whole body at once). The seah is an ancient measure of volume. The Shulchan Aruch gives the measure in finger-widths: 44,118 and a half cubic finger-widths, for a cubit of six handbreadths and half a finger-width (Yoreh De’ah 201:1). According to the finger-width standard adopted by contemporary authorities (of the order of 2 to 2.4 cm, an approximate calculation), this comes to a few hundred liters, about 350 to 600; this is why a much larger pool is always built, in which one can immerse oneself standing up.

Rainwater, Spring Water, “Drawn” Water

The water of a mikveh must come from a spring or from rain. One contrasts water that comes “from the hands of Heaven” (Rambam, Hilchot Mikvaot 4:2) with “drawn” water (she’uvin), that is, water collected in a vessel by man. Here one of the most learned points of the subject opens up, because the Rishonim (the medieval authorities) did not rule on it in the same way.

The Rambam explains that, according to the Torah, any gathered water suffices, whether drawn or not. It is “from the words of the scribes” (mi-divrei soferim), thus of the Sages, that drawn water is invalid, and that three log (of the order of a liter) of drawn water falling into a mikveh of less than forty seah invalidate it; he connects this to a comparison in the verse, “a spring, a cistern, a gathering of water” (Vayikra 11:36): the spring has nothing of man, the cistern everything of man, and the mikveh must not be entirely one or the other (Hilchot Mikvaot 4:1-2). The Sefer Ha-Chinuch (mitzvah 175) holds the same position. By contrast, the Rema, in the Shulchan Aruch, reports, following the Rosh and many halachic authorities, that if the whole mikveh is made of drawn water, it is invalid from the Torah; but if only the minority of the water is drawn, it is only rabbinic (Yoreh De’ah 201:3). The practical rule is therefore that of the greatest care: one does not build a mikveh with drawn water.

The Mishna describes the borderline cases: a mikveh that has received three log of drawn water is invalidated (Mikvaot 3:1); vessels left under a gutter can invalidate it (Mikvaot 4:1). It also acknowledges that the sea has, according to Rabbi Meir, the status of a mikveh (“And the gathering of the waters He called seas,” Bereshit 1:10), whereas Rabbi Yehuda says this only of the Great Sea (Mikvaot 5:4). The Shulchan Aruch rules that seas have the status of a spring (Yoreh De’ah 201:5).

How Is a Mikveh Supplied in the Middle of a City?

This is achieved thanks to a principle of the Mishna: drawn water becomes valid if it is brought into contact with the water of a valid mikveh. The two are “touched,” even “by a hair” (Mikvaot 6:8). Two mikvaot can also be connected by an opening “like the tube of a waterskin” (Mikvaot 6:7). The Rambam describes this process of contact (hashakah): water is passed through a clay or lead pipe so as to mingle it with the water of the mikveh (Hilchot Mikvaot 8:7).

Modern mikvaot apply this principle: a reservoir collects rainwater beneath the visible pool, connected to it by an opening. Tap water, filtered, heated and treated, can then be added, and it “mingles” with the natural water through this contact (see Shulchan Aruch, Yoreh De’ah 201:52, on the width of the opening). These techniques are the work of specialized architects and rabbis, and a mikveh is always supervised and certified by a competent rabbi. The pool must be fixed in the ground or built into it: the Rambam opens his laws with the rule that the impure are purified only by immersion “in water gathered in the earth” (Hilchot Mikvaot 1:1).

Nothing Must Form a Barrier

Immersion must cover the whole body, hair included, in a single act. Nothing must form a barrier (in Hebrew, chatzitzah) between the body and the water: jewelry, nail polish, paste, dried dirt. The Mishna lists the barriers (threads of wool or flax, ribbons in the hair; Mikvaot 9:1). The Gemara (Eruvin 4b) sees in “all his flesh” the source of this requirement, with an oral tradition for hair: a single knotted hair forms a barrier, three hairs knotted together do not.

The Rambam then distinguishes two levels. According to the Torah, a foreign body forms a barrier if it covers the greater part of the body and if the person attaches importance to it; the Sages extended the prohibition to anything one cares about, even minor (Hilchot Mikvaot 1:12). The Shulchan Aruch specifies that what counts is what most people care about, even if a particular person does not; and the Rema adds that, at the outset, one avoids immersing even with things that would not form a barrier (Yoreh De’ah 198:1). This is why immersion is preceded by meticulous preparation: washing carefully, combing one’s hair so that it is not tangled, inspecting oneself, taking a hot bath (Yoreh De’ah 199:1), and removing jewelry and polish.

Ritual Purity, Not Hygiene

This is the point that is least easily understood. The Hebrew word tumah, often rendered “impurity,” has nothing to do with dirt. A child covered in mud is not tamei; a person who is impeccably clean can be. Tumah is a legal and spiritual category, connected to the great boundaries of life: death (Bamidbar 19:11), certain illnesses, certain discharges of the body. It concerns access to the Temple and to holy things. And it is not a fault: caring for the deceased is a mitzvah, and it renders one tamei.

The Rambam says this plainly at the end of his Laws of Ritual Baths, in two steps. First: “Impurities and purities are decrees of Scripture; they do not belong to what human intelligence decides (…). Impurity is not mud or filth that water would remove”: אֵין הַטֻּמְאָה טִיט אוֹ צוֹאָה שֶׁתַּעֲבֹר בְּמַיִם אֶלָּא גְּזֵרַת הַכָּתוּב הִיא. The bath belongs to the chukim, the laws for which the Torah does not indicate the reason, and “the matter depends on the intention of the heart.” Then he sees in it an allusion: just as one who immerses with the intention of purifying himself becomes pure “without anything changing in his body,” so one who decides in his heart to turn away from evil thoughts and plunges his soul “into the waters of knowledge” becomes pure. He cites Yechezkel 36:25 (Hilchot Mikvaot 11:12).

One should also read the Guide for the Perplexed, where the Rambam gives the laws of purity more pragmatic reasons: they maintain the reverence due to the Sanctuary (one does not enter it at any time, so numerous are the causes of impurity) and keep man at a distance from what is dirty (III:47). The two texts do not say the same thing: one seeks the purpose of the laws for the people, the other rules out the idea that water “washes” anything.

The Sefer Ha-Chinuch (mitzvah 175) offers, for children, a simpler reading: immersion recalls that man must cleanse his soul of every fault, as water cleans what is plunged into it. It adds that it is not the way of pious people to remain in impurity: impurity is repugnant, purity is loved, and the soul is raised by purity.

Who Immerses, and Why?

The Woman: Family Purity (Taharat Ha-Mishpachah)

This is the most widespread use today. The text of the Torah is brief: the woman who has her period “shall be seven days in her state of niddah” (Vayikra 15:19), and the man must not “approach her to uncover her nakedness” (Vayikra 18:19). The oral tradition developed the rest.

The seven “clean” days. According to the Torah, the niddah‘s waiting time is seven days, counted from the start of the period. But the Talmud reports that “the daughters of Israel took a stricter stance upon themselves”: even if they see only a drop of blood “like a mustard seed,” they count seven clean days after it stops (Niddah 66a; Berakhot 31a, which cites this rule as an example of established halacha: בנות ישראל החמירו על עצמן). The Rambam specifies that this custom has become universal: the woman counts seven clean days like a zavah gedolah (Vayikra 15:25-28), then immerses “on the night of the eighth day” (Hilchot Issurei Biah 11:4). Before beginning the count, she makes sure the bleeding has ended by an examination (hefsek taharah), to be done toward sunset (Shulchan Aruch, Yoreh De’ah 196:1).

Immersion at night. The Talmud reports a discussion between Rav and Rabbi Yochanan: for the niddah, immersion is done at night, “lest her daughter imitate her” and immerse on a day when immersion is not valid, for example the seventh day (Niddah 67b). The Shulchan Aruch makes it the rule: she does not immerse by day (Yoreh De’ah 197:1-3). If her husband is in town, the mitzvah is to immerse at the scheduled time, without delaying even by a night, because of the mitzvah of procreation; the Rema permits, under certain conditions, immersion on Friday night, but local customs are stricter (Yoreh De’ah 197:2). The bride may immerse before the chuppah in broad daylight, since she joins her husband only after nightfall (Rema, Yoreh De’ah 197:3).

The preparation and the blessing. The preparation is described in the Shulchan Aruch (Yoreh De’ah 198-199; 201 for the mikveh). A well-known divergence concerns the moment of the blessing (“asher kidshanu… al ha-tevilah,” “who has sanctified us with His commandments and commanded us concerning immersion”). Rabbi Yosef Karo (the Mechaber), whom Sephardim follow, prescribes it before immersion, the woman still wearing her robe; the Rema notes that some say it after immersion, while she covers herself in the water, and that this is the custom that became established in Ashkenazi communities (Yoreh De’ah 200:1). These are differences of custom that one learns from one’s rabbi or from the mikveh attendant.

Intention. Is intention (kavanah) needed for the immersion of the niddah to be valid? The Shulchan Aruch rules that a niddah who fell into the water without intention (or who went down only to cool off) is permitted to her husband; the Rema adds that some require a second immersion, and that one should be strict at the outset (Yoreh De’ah 198:48). We see here the distinction between what is required for immersion to be valid and what one does in practice, at the outset.

Why this separation? The Talmud reports the explanation of Rabbi Meir: why did the Torah provide for seven days of niddah? Because a man grows used to his wife and ends up growing weary of her; so the Torah says “she shall be impure seven days,” “so that she may be as dear to her husband as at the moment she entered the chuppah” (Niddah 31b: כדי שתהא חביבה על בעלה כשעת כניסתה לחופה). This is the reason given by the Talmud; it is not a law, but it explains the rhythm.

Mishna Shabbat 2:6 lists the niddah together with challah (separating a portion of dough) and the lighting of the Shabbat candle among the three offenses for which “women die in childbirth.” This passage, which in the Mishna concludes the exposition on the Shabbat lights, is aggadic in nature; it is not used as a rule, but it shows the place of these three mitzvot in the tradition.

The subject touches on intimacy; three points deserve to be set out calmly.

There is no judgment and no shame. The woman is not “dirty” during the niddah: the law describes a change of status, tied to the cycle of life, which sets the rhythm of the couple’s life. Modesty is a principle: the Rema reports the custom of discretion on the night of immersion (Yoreh De’ah 198:48).
The mikveh is a private act. In most mikvaot, an attendant (the balanit) welcomes the woman with discretion. In communities, it is a respected and confidential role.
The counting of days is precise and is transmitted personally. For any particular situation (irregular cycle, childbirth, illness, pregnancy), one should consult a competent rabbi, or an advisor trained for this purpose.

The Convert

Conversion takes place, according to the Talmud, through circumcision for a man, immersion and acceptance of the mitzvot before a rabbinic court, the beit din. The Talmud reports an ancient disagreement (Yevamot 46a): Rabbi Eliezer holds that a man who is circumcised but not immersed is a convert (“for our fathers were circumcised without immersing”); Rabbi Yehoshua that one who immersed without being circumcised is one as well (“for our mothers immersed without being circumcised”); the Sages require both. Their opinion is the one adopted: the convert must first be circumcised (Shulchan Aruch, Yoreh De’ah 268:1).

The founding text is Yevamot 47a-b: the candidate is asked: “What have you seen that you want to convert?” He is informed of “some light mitzvot and some serious mitzvot,” without insisting too much, and if he accepts, he is circumcised without delay; once healed, he is immersed, “two disciples of the wise (the Talmud specifies: three) standing near him” to instruct him again. For a woman: “the women make her sit in the water up to her neck, and the two sages stand outside” to instruct her. The baraita adds: “where the niddah immerses, there the convert immerses”: a mikveh of forty seah, and whatever forms a barrier for the niddah forms a barrier for the convert. Once immersion is done, “he is like an Israelite in everything” (Yevamot 47a-b).

The Rambam gives it shape: Israel entered the covenant by three acts, circumcision, immersion and a sacrifice (Hilchot Issurei Biah 13:1-4), deduced by relying on “as you are, so is the convert” (Bamidbar 15:15); the Talmud asks where the immersion of our ancestors is derived from, and answers: from the sprinkling of the blood at the covenant of Sinai (Shemot 24:6-8), since “there is no sprinkling without immersion” (Keritot 9a). The Rambam then describes the procedure: the three judges, the woman in the water up to her neck, the judges who turn away when she comes out of the water (Issurei Biah 14:1-6). The Shulchan Aruch requires three valid judges and daytime, for the instruction on the mitzvot, the circumcision and the immersion. After the fact, an immersion done before two judges or at night is held valid by some, but the Rif and the Rambam consider it invalid (Yoreh De’ah 268:3). The detail is a matter for the beit din; it is not a point one settles alone.

Conversion is often compared to a birth, and here one must distinguish the legal level from the poetic one. The Talmud indeed says: “a convert is like a newborn child” (גר שנתגייר כקטן שנולד דמי). But the expression is used as a principle of law, to explain that family ties from before the conversion no longer have effect: for the testimony of two brothers who converted (Yevamot 22a), for fertility and the inheritance of the firstborn (Yevamot 62a, in the dispute between Rabbi Yochanan and Resh Lakish), or in Rabbi Yose, who uses it to challenge the idea of reproaching converts for their past (Yevamot 48b). It is a principle of law, not an allegory. The spiritual image of rebirth has been grafted onto it, and it is beautiful; but it is not the meaning of the Talmudic sentence.

For everything concerning conversion, see also our article Who Is Jewish? And How Does One Become Jewish?.

Men

Men are subject to no regular obligation of immersion today, but several customs have developed, whose origin deserves to be set out precisely.

The decree of Ezra. The Talmud reports that Ezra the scribe, at the time of the return from exile (fifth century before the common era according to the usual dating), instituted that a man who has had an emission of seed immerse before studying Torah or praying (Berakhot 22a-b: עזרא תקן טבילה לבעלי קריין). The Shulchan Aruch gives the reason: “so that the scholars should not be with their wives like roosters.” But this institution was annulled: it had not been adopted by everyone, and the public did not have the strength to keep it (Rambam, Hilchot Tefillah 4:5; Shulchan Aruch, Orach Chaim 88:1: a man may study, recite the Shema and pray “without immersion and without nine kav“). The Mishnah Berurah (88:4) notes that some pious men continue to observe it by immersion, and that those for whom this is difficult are content with nine kav of water poured over them. The Rambam also notes a custom “common in Babylonia and in Spain”: one does not pray before washing the whole body, according to “prepare to meet your G-d, Israel” (Amos 4:12; Hilchot Tefillah 4:6).

The eves of festivals. There are several customs. On the eve of Rosh Hashanah, some immerse (Rema on Shulchan Aruch, Orach Chaim 581:4). On the eve of Yom Kippur, the Shulchan Aruch says one may immerse, but without saying a blessing (Orach Chaim 606:4); the Rema specifies that a single immersion suffices, without confession, since it is done “because of the emission of seed,” that one can make up for it by having nine kav poured over oneself, and that a mourner may also immerse on that day. The Mishnah Berurah (606:19-21) recalls that this immersion is only a custom, that some see in it rather a gesture of teshuvah and immerse three times, and that one immerses on Yom Kippur even if one has already immersed on Rosh Hashanah.

Circles of fervor. In certain kabbalistic and chasidic circles, people immerse more often (for example before Shabbat or every morning). This is a community custom, with no obligatory character, and each person follows the custom of his own.

The high priest. In the Temple, “no one enters the courtyard for the service, even if pure, before having immersed”; the high priest immerses five times on Yom Kippur and sanctifies his hands and feet ten times (Mishna Yoma 3:3), in accordance with the verses Vayikra 16:4 and 16:24. See our article on Yom Kippur.

Utensils: Tevilat Kelim

The mikveh is not reserved for people. A table utensil made of metal or glass purchased from a non-Jew must be immersed before its first use (Shulchan Aruch, Yoreh De’ah 120:1). The Mishna states the rule (Avodah Zarah 5:12), and the Talmud connects it to the verse of Bamidbar 31:21-23, on the spoils of Midian: “Everything that goes through fire, you shall pass through fire, and it shall be pure, but it shall also be purified with the water of lustration.” Rava reads in it an additional purity, “and it shall be pure,” which requires immersion in forty seah; Bar Kappara deduces from “water of niddah” that this water is the one in which the niddah immerses (Avodah Zarah 75b). Rav Ashi extends the rule to glass, which “has a remedy when it breaks,” like metal.

The Rambam presents this immersion not as a rule of ritual purity but as a provision of the Sages (mi-divrei soferim) for which the verse is an allusion: it aims to “purify” the utensil from non-Jewish use (Hilchot Ma’achalot Assurot 17:3-6). Commentators debate the scope of this expression: simple reliance on the verse, or a deduction that would go back to the Torah. A blessing is recited (“al tevilat keli,” or “kelim” if there are several: Shulchan Aruch, Yoreh De’ah 120:3). Borrowed or rented utensils need not be immersed (Yoreh De’ah 120:8); and for utensils coated with lead on the inside, the Rema notes that they are immersed without a blessing (Yoreh De’ah 120:1). The details (materials, blessing, doubtful cases) are a matter for the rabbi. See also What Does “Kosher” Mean? Kashrut Explained.

Other Customs

There is also the immersion of the bride before her wedding, a very widespread practice (Rema, Yoreh De’ah 197:3), which is part of the preparation for the chuppah (see The Jewish Wedding: Chuppah, Ketubah and the Broken Glass). The ritual cleansing of the deceased (taharah), performed by the Chevra Kadisha, the burial society, also includes a complete washing “so that he may be clean of all impurity” (Shulchan Aruch, Yoreh De’ah 352:4; see Mourning in Judaism).

Overhead view of a pool of limpid water with white steps, in a sober and bright modern mikveh

A Little History and Archaeology

Mikvaot are among the most frequent remains of Jewish life in the Land of Israel in the Second Temple period: hundreds have been discovered, in Jerusalem, Hebron, Masada, Hannaton and elsewhere. Installations built for this use appear in the remains from about the first century before the common era; before that date, one may suppose that people immersed in springs or non-specialized pools, but the installations cannot be identified as such. The reference synthesis is that of Ronny Reich, Miqwa’ot (Jewish Ritual Baths) in the Second Temple, Mishnaic and Talmudic Periods (in Hebrew, Yad Ben-Zvi and the Israel Exploration Society, Jerusalem, 2013).

In Jerusalem, excavations carried out south of the Temple Mount and in the Jewish Quarter of the Old City (the work of Benjamin Mazar and Nahman Avigad) have uncovered numerous pools cut into the rock, often with steps, as well as houses of the Herodian period equipped with their own mikveh (Nahman Avigad, Discovering Jerusalem, 1983). At Masada, Herod’s fortress, Yigael Yadin’s excavations revealed installations of the same kind (Masada: Herod’s Fortress and the Zealots’ Last Stand, 1966). Their large number leads archaeologists to see in them a social fact, and not only the concern of priests; the Mishna recalls moreover that no one entered the Temple courtyard for the service without having immersed (Yoma 3:3).

After the destruction of the Temple, the use of the mikveh continued across the centuries and continents, and remarkable medieval mikvaot have been preserved. At Speyer, the mikveh was built in the early twelfth century (it is mentioned in 1126); at Worms, an underground mikveh was built in 1186 near the synagogue. These two sites, with those of Mainz, were inscribed on the UNESCO World Heritage List in 2021 under the name “ShUM sites.” In France, the medieval mikveh of Montpellier (twelfth century, dismantled after the expulsion of 1306, rediscovered in the early 1980s and classified as a historic monument in 2004) and that of the synagogue of Carpentras (built in 1367, with a mikveh about ten meters deep) recall that the Jews of France, too, dug down to living water.

From the staircase cut into the rock in Jerusalem to the underground pools of Speyer, Worms or Montpellier, the form of the installation has changed little: a dug pool, a staircase, natural water.

Halacha and Spiritual Reading: What the Texts Say, and What They Suggest

Two registers should be kept apart. Halacha is what is required: valid water, a volume, a complete immersion without any barrier, a time. The spiritual tradition is what the Sages and thinkers read into the gesture. It enriches the practice; it does not replace it, and it has no normative value.

“Mikveh Yisrael, Hashem”

The most beautiful text is the last one in the Mishna of Yoma (8:9), taken up in the Talmud (Yoma 85b). After establishing that Yom Kippur does not erase wrongs against others until one has appeased them, Rabbi Akiva exclaims: “Happy are you, Israel! Before whom are you purified, and who purifies you? Your Father in heaven, as it is said: ‘I will sprinkle pure water upon you and you shall be pure’ (Yechezkel 36:25), and it is said: ‘Mikveh Yisrael, Hashem’ (Yirmeyahu 17:13). Just as the mikveh purifies the impure, so the Holy One, blessed be He, purifies Israel.” (מה מקוה מטהר את הטמאים — אף הקדוש ברוך הוא מטהר את ישראל).

The wordplay rests on the double meaning of mikveh: “gathering of water” and “hope” (tikvah): “the Hope of Israel is the L-rd,” or “the mikveh of Israel is the L-rd.” The passage says that purity is not an act one administers to oneself: it is a relationship. Water is a sign; what it signifies is the ever-open possibility of renewal.

Death and Life: A Modern Reading

Rabbi Aryeh Kaplan, in Waters of Eden: The Mystery of the Mikvah (1976), proposes that almost all impurities are tied to death (or, for the niddah, to the loss of a potential life), and that the water of the mikveh, brought together with the water that flows out of Eden, a source of life, answers them. Others connect the number forty with the forty days of the flood (Bereshit 7:4), the forty days of Moshe on Sinai (Shemot 24:18) or the period when the embryo is still “only water” (Yevamot 69b). These are the readings of preachers, not the reason for the number: the Gemara says that forty seah is the measure of a cubit by a cubit by three cubits (Eruvin 4b). One may enjoy them; one does not teach them as law.

What Rav Raphaël Benizri teaches

Rav Benizri did not devote a lecture to the mikveh as such. Two of his published lectures touch on it in passing, and we report them without adding anything.

In the first lecture devoted to Eshet Chayil (Mishlei 31), he sets out what halacha says about the legal status of woman before showing that her dignity is played out elsewhere. To illustrate the limit placed on her word, he takes the example of the conversion of a woman: immersion takes place, for reasons of decency, in the presence of a woman, but the word of the mikveh attendant is not enough to validate the conversion. Rabbis must stand on the other side of the partition, be informed that the immersion was complete, and question the candidate about her intentions; it is their declaration that makes the conversion regular. This procedure is the one described by the Talmud (Yevamot 47a-b) and the Rambam (Issurei Biah 14:6). See the lecture: Eshet Chayil, Part 1: The Status of the Feminine.
In his lecture on Rachel and Leah (Vayetze), the Rav rereads the story of the “signs” that Rachel and Yaakov had agreed on and that Rachel finally passed on to her sister. These signs, he says, related to the three obligations that underlie their marriage; the transcript of the lecture names the niddah among them, and associates these obligations with the question of whether love can escape routine and the mere cycle of natural attraction. The fact that Rachel handed the signs over to Leah is already found in the Talmud (Megillah 13b) and in Rashi (on Bereshit 29:25). See the lecture: Vayetze: Rachel and Leah, Two Faces.

The Mikveh Today: A Living Practice

The mikveh is far from being a relic. In almost all Jewish communities in the world, a mikveh is built and maintained by the community, often much more modern than one imagines: individual bathrooms, discreet reception, rigorous maintenance, heated and treated water.

Here, in general terms, is how an immersion for taharat ha-mishpachah goes. The woman arrives after nightfall and prepares: bath or shower, brushing her teeth, untangling her hair, removing anything that could form a barrier. She enters the pool and immerses completely, body and hair covered by water. She says the blessing at the moment prescribed by her community, then immerses again according to custom (the number of immersions varies according to custom). The rite is simple.

For any particular situation, one should turn to one’s rabbi or the mikveh attendant; it is not a point to settle alone with a book. This article presents the broad outlines; it does not replace a consultation.

Common Misconceptions About the Mikveh

“It’s a Hygienic Bath”

No. One enters it clean, and the water does not “wash” anything there: “impurity is not mud or filth” (Rambam, Hilchot Mikvaot 11:12). The Shulchan Aruch says that a woman does not leave her state by washing in a bath, “even if all the waters of the world passed over her” (Yoreh De’ah 201:1): an ordinary shower or swimming pool has no mikveh value whatsoever.

“The Mikveh Is Meant to Say That a Woman Is Dirty”

No, again. Tumah is not dirt and is not a judgment. It also affects men, in several situations in the Torah (Vayikra 15). And family purity is described by the Sages as a way of keeping the couple fresh (Niddah 31b). Some women find in it a time of renewal; others have questions, and it is legitimate to put them to a rabbi or an advisor.

“It’s a Jewish Baptism”

There are surface resemblances (water, an immersion), but the comparison stops there. In Judaism, immersion does not confer salvation and does not remit sins: sin is repaired by teshuvah, and Rabbi Akiva’s image is precisely that G-d purifies Israel as the mikveh purifies the impure (Yoma 8:9). One immerses oneself, and does so many times in a lifetime. Mikvaot existed well before Christianity, as the excavations show; historians note kinships between the immersion practices of the time and baptism, but the nature of the rite has changed.

“It’s a Practice Reserved for Women”

No. Converts, men and women, immerse in it; men go there before Yom Kippur; and utensils pass through it too.

“It No Longer Exists, or Only Among the Ultra-Orthodox”

False. The mikveh is used in all observant communities, Sephardic, Ashkenazi, chasidic, modern.

Frequently Asked Questions About the Mikveh

What Is a Mikveh in One Sentence?

It is a pool of natural water, of at least forty seah, built according to halacha, in which one immerses completely in order to change ritual status: to regain purity, to enter the Jewish people, or to make a utensil fit for use.

Why Forty Seah?

It is the volume of a pool one cubit by one cubit, three cubits high: the water in which “his entire body can go up” (Eruvin 4b; Rambam, Hilchot Mikvaot 4:1).

Can One Immerse in the Sea or in a River?

The sea, rivers and springs are valid waters in principle (Mikvaot 5:4; Shulchan Aruch, Yoreh De’ah 201:2 and 5), but there are precise conditions (for example for rivers swollen by rain, where the Rema recommends strictness) and questions of safety, temperature and modesty. In practice, a purpose-built mikveh is used. In case of doubt, consult a rabbi.

Who Must Immerse?

Converts, at the end of their conversion; married women, at the end of each period of niddah; those who follow particular customs, such as many men before the major festivals; and new table utensils bought from a non-Jew. For any particular situation, consult a rabbi.

Is the Mikveh Clean?

Yes. The water is filtered, treated and renewed, and one prepares carefully before immersion: ritual purity is not hygiene, but the law also requires that one be clean in order to immerse (Shulchan Aruch, Yoreh De’ah 199:1).

Do Men Have to Go to the Mikveh?

There is no regular obligation today, apart from conversion: the decree of Ezra on the immersion of one who has had an emission of seed was annulled (Shulchan Aruch, Orach Chaim 88:1). But the custom of going before Yom Kippur is widespread (Orach Chaim 606:4), and others observe it before Rosh Hashanah (581:4).

What Is a Mikveh and Why Do Jews Immerse in It?