Sefer HaMitzvot, Positive Commandments
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היא שצונו להיות היולדת טמאה. ומצוה זו כוללת כל משפטי יולדת. (תזריע, טהרה משכב ומושב פ"ה):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded us that a woman after childbirth be impure. And this commandment includes all of the regulations of a woman after childbirth. (See Parashat Metzora; Mishneh Torah, Those Who Defile Bed or Seat 5.)