Levítico 12:4 Referencias de la Mishná: Mishnah Keritot, Mishnah Makkot, Mishnah Niddah & Mishnah Eduyot

If a woman miscarries on the eve of the eighty-first day: Bet Shammai say: she is exempted from an offering. But Bet Hillel say: she is liable. Bet Hillel said to Bet Shammai: what is the difference between the eve of the eighty-first day and the eighty-first day itself? Since these are considered equal with regard to [blood] uncleanness, why should they not be considered equal also with reference to the offerings? Bet Shammai said to them: No; if you said this in the case where she miscarries on the eighty-first day where it occurred at a time when she was fit to bring an offering, can you say this where she miscarries on the eve of the eighty-first day, where it did not occur at a time when she was fit to bring an offering? Bet Hillel said to them: the case of a woman who miscarries on the eighty-first day which fell on a Shabbat shall prove it, where it did not take place at a time when she was fit to bring an offering and yet she is liable to bring a [new] offering. Bet Shammai said to them: No; if you says this of the eighty-first day which fell on a Shabbat for although it is not fit for offerings of an individual, it is at least fit for communal offerings, would you maintain this concerning a woman who miscarries on the eve of the eighty-first day, seeing that the night is fit neither for offerings of the individual nor for communal offerings? As to [your argument of the uncleanness of] the blood, it proves nothing, for if she aborted within the period of cleanness the blood is unclean, and yet she is exempted from an offering.

An unclean person who ate holy meat (Leviticus 7:20, 12:4); One who entered the sanctuary while unclean (Leviticus 12:4, Numbers 5:3, 19:13); One who ate forbidden fat or blood (Leviticus 3:16, 7:23-27); Or leftover sacrificial meats (Leviticus 19:6-8); Or sacrifices that had been offered up with improper intention (Leviticus 7:18); Or [an offering] that has became unclean (Leviticus 7:19); One who slaughters, or offers up a sacrifice, outside the Temple precincts (Leviticus 17:4); One who ate leavened [bread] during Passover (Exodus 12:15,; One who partakes of food [or drink] or does work on the Day of Atonement (Leviticus 23:27-31); One who puts together the ingredients for the [anointing] oil, or the ingredients for the incense, or anoints with the oil for anointing (Exodus 30:22-28): One who eats an animal that died a natural death (Deuteronomy 14:21); Or was improperly slaughtered (Exodus 22:30); Or any of the [creatures deemed] ‘abominable’ and ‘teeming’ (Leviticus 11:11,. One who eats non-tithed produce, or first-tithe from which heave offering has not been removed, or unredeemed second-tithe, or unredeemed sanctified property. How much untithed produce is one to eat to become liable? Rabbi Shimon says: “Any amount.” The Sages say: “An olive's size.” Rabbi Shimon said to them: “Do you not admit that if one ate the minutest ant that he would be liable? They said to him: “[Only] because it is a whole creature.” He said to them: “Even a grain of wheat is a whole entity.”

The blood of a Gentile and the clean blood of a metzoraat (a woman with scale disease): Bet Shammai declares clean. And Bet Hillel holds that it is like her spittle or her urine. The blood of a woman after childbirth who did not immerse [in a mikveh]: Bet Shammai says it is like her spittle or her urine, But Bet Hillel says: it conveys uncleanness both when wet and when dry. They agree that if she gave birth while in zivah, it conveys uncleanness both when wet and when dry.