레위기 15:2 미슈나 참조: Mishnah Eduyot, Mishnah Niddah & Mishnah Nazir

Rabbi Akiba declared three things; about two they agreed with him, and about one they disagreed with him.About a lime-burner’s sandal, that it is liable to contract midras impurity; And about the remains of a [broken] oven, that they must be four handbreadths high [in order to retain impurity], whereas they used to say three and [when he said four] they agreed with him. And about one they disagreed with him About a stool, from which two of its covering-boards had been removed, the one beside the other, which Rabbi Akiba pronounces able to contract impurity, but the Sages declare unable to contract impurity.

Rabbi Judah says: there are six instances of lenient rulings by Beth Shammai and stringent rulings by Beth Hillel.The blood of a carcass: Beth Shammai pronounces it clean, And Beth Hillel pronounces it unclean. An egg found in a [bird’s] carcass: if the like of it were sold in the market, it is permitted, and if not, it is forbidden, according to the opinion of Beth Shammai. And Beth Hillel forbids it. But they agree in the case of an egg found in a trefa [bird] that it is forbidden since it had its growth in a forbidden condition. 3+4) The blood of a non-Jewish woman and the blood of purity of a leprous woman: Beth Shammai pronounces clean; And Beth Hillel says: [it is] like her spittle and her urine. One may eat fruits of the seventh year with an expression of thanks and without an expression of thanks [to the owner of the field], according to the opinion of Beth Shammai. But Beth Hillel says: one may not eat with an expression of thanks. Beth Shammai says: a waterskin [is liable to become impure only if it is] tied up and remains unimpaired. And the school of Hillel says: even if it is not tied up.

For a fetus born from its mother's side, she does not sit the prescribed days of uncleanness nor the days of cleanness, nor does one incur on its account the obligation to bring a sacrifice. Rabbi Shimon says: it is regarded as a regular birth. All women are subject to uncleanness [as soon as the blood appears] in the outer chamber, as it says, "her discharge being blood in her body" (Leviticus 15:19). But a zav and one who emitted semen convey no uncleanness unless the discharge came out of the body.