The Laws › Commandment #87
Commandment #87 · Positive · Purity Laws

A Man With an Emission Immerses for Purification — Zav

טָהֳרַת זָב
Source: Leviticus 15:13  ·  Maimonides, Sefer HaMitzvot, Positive #87

Leviticus structured a man's bodily discharge with the very same purification rhythm it gave to a woman's monthly cycle — counting, washing in running water, and a clear return to full covenant life, applied without a double standard.

וְכִי יִטְהַר הַזָּב מִזּוֹבוֹ וְסָפַר לוֹ שִׁבְעַת יָמִים לְטָהֳרָתוֹ וְכִבֶּס בְּגָדָיו וְרָחַץ בְּשָׂרוֹ בְּמַיִם חַיִּים וְטָהֵר
"And when he that hath an issue is cleansed of his issue; then he shall number to himself seven days for his cleansing, and wash his clothes, and bathe his flesh in running water, and shall be clean."

The Same Law, Applied Without a Double Standard

Leviticus 15 places the laws governing a man's bodily discharge and a woman's monthly cycle within a few verses of each other, using nearly identical language — count seven days, wash, immerse in running water, return. The structure is symmetrical by design: the Torah did not build one purity system for women and a lighter one for men. Whatever a body experienced, male or female, voluntary or not, fell under the same logic of temporary separation and the same clear path back. Holiness was not a standard applied unevenly — it was a single framework wide enough to cover the full range of human bodily life.

Holiness Even in the War Camp

Deuteronomy extends this same logic into a setting that might seem far removed from the sanctuary — the army camp at war. A soldier who had a nocturnal emission had to leave the camp, wash in the evening, and return only at sundown, "because the LORD thy God walketh in the midst of thy camp...therefore shall thy camp be holy" (Deuteronomy 23:10-14). Even in the chaos and exhaustion of warfare, the most private and involuntary of bodily realities was treated with the same dignity and the same structure — because wherever Israel went, it carried the conviction that God was present in the midst of it.

A Body Worth Structuring

Paul later told the believers at Corinth that "your body is the temple of the Holy Ghost which is in you" (1 Corinthians 6:19) — language that, whatever else it does, assumes the same conviction running through Leviticus 15: that the human body is not an embarrassment to be managed around faith, but a thing significant enough to be structured by it. A commandment that seems, on the surface, to be about managing an awkward biological reality is actually built on the deeper claim that nothing about a person — not even what happens involuntarily, in private — falls outside the reach of God's covenant attention.

Key Figures

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The Soldier in the Camp — Holiness Carried Into War
Deuteronomy 23 applies this exact law's logic to the battlefield itself — proof that the structure of purity was not confined to the sanctuary but traveled wherever Israel believed God was present.
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Paul at Corinth — Naming Why the Body Matters This Much
His claim that the body is "the temple of the Holy Ghost" gives later words to the same conviction Leviticus 15 had already assumed: that what happens in and to a body is significant enough to be structured by holiness.

Study Questions

For reflection and group study
Leviticus 15 applies nearly identical language and structure to both male and female bodily conditions within the same chapter. What does that symmetry reveal about how the Torah weighs different kinds of people and different kinds of bodies?
See Lev 15:13,28; Gal 3:28
This commandment governs something entirely involuntary and private — not a moral failing, but a bodily reality. What does it mean that the Torah built a structured, dignified path back to full participation for something a person could not control?
See Lev 15:13,16; Ps 139:1–4
Deuteronomy extends this same purity logic into the war camp, calling soldiers to the same washing and waiting 'because the LORD thy God walketh in the midst of thy camp.' What does carrying sanctuary-level holiness into the chaos of battle reveal about where Israel believed God's presence actually was?
See Deut 23:9–14; Lev 15:13
Paul calls the body 'the temple of the Holy Ghost.' How does that claim echo, in different language, the conviction already built into this commandment — that the body matters enough to be structured by holiness?
See 1 Cor 6:19–20; Lev 15:13
'Running water' is specified again here, just as in the general mikveh law. Why might the Torah keep returning to an element that comes from outside human control as the means of restoration?
See Lev 15:13; Ezek 47:9; John 7:38

Read this commandment in the original Hebrew.

Open Leviticus 15:13 in Torah Reader