출애굽기 19:15 미슈나 참조: Mishnah Yevamot, Mishnah Mikvaot & Mishnah Shabbat

A man shall not abstain from procreation unless he already has children. Beth Shammai says: two males, And Beth Hillel says: male and a female, for it says, “Male and female created he them” (Genesis 5:2). If a man married a woman and lived with her for ten years and she bore no child, he may not abstain [any longer from the duty of propagation]. If he divorced her she is permitted to marry another, and the second husband may also live with her for ten years. If she miscarried [the period of ten years] is counted from the time of her miscarriage. A man is commanded concerning the duty of propagation but not a woman. Rabbi Yohanan ben Beroka says: Concerning both of them it is said, “And God blessed them; and said to them… “Be fruitful and multiply” (Genesis 1:28).

If he emitted thick drops from his member, he is unclean, the words of Rabbi Elazar Hisma. If one had sexual dreams in the night and arose and found his flesh heated, he is unclean. If a woman discharged semen on the third day, she is clean, the words of Rabbi Elazar ben Azariah. Rabbi Ishmael says: sometimes there are four time periods, and sometimes five, and sometimes six. Rabbi Akiva says: there are always five.

How do we know that if one [a woman] discharges semen on the third day she is unclean? Because it is said, “Be ready for the third day” (Exodus 19:15). How do we know that one who has been circumcised may be bathed on the third day [after circumcision] which falls on Shabbat? Because it is said, “And it came to pass on the third day, when they were in pain” (Genesis 34:25). How do we know that a crimson-colored strap is tied to the head of the goat that is sent [to Azazel]? Because it is said, “If your sins be as scarlet, they shall be as white as snow” (Isaiah 1:18).