Commentary for Chagigah 21:12

טהרות: מיכתב כתיבן לא נצרכא אלא לשיעור מקוה דלא כתיבא דתניא (ויקרא טו, ו) ורחץ (את בשרו) במים במי מקוה את כל בשרו מים שכל גופו עולה בהן וכמה הן אמה על אמה ברום שלש אמות ושיערו חכמים מי מקוה ארבעים סאה:

[Ritually] clean. ... But they are surely written! It was only necessary [to teach this] for the size of a ritual purity bath, which isn't written. For it was taught in a Baraita, (Leviticus 15:6) "And he shall wash his flesh in water" - ["he shall wash" refers to] the waters of a ritual purity bath "all his flesh," - [refers to] water into which his whole body can enter. And how much is that? Cubit upon cubit to the height of three cubits. The sages have calculated the waters of a ritual purity bath as forty seahs.

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