Mischna zu Dewarim 25:7

Beth Shammai permits the rival wives [of a deceased brother to be married] to the [surviving] brothers; But Beth Hillel forbids them. If they have performed halitzah, Beth Shammai pronounce them unfit to [marry into] the priesthood, But Beth Hillel pronounced them fit. If they have married their brother-in-law, Beth Shammai pronounce them fit [to marry into the priesthood], But Beth Hillel pronounced them unfit. And although these pronounce unfit and these pronounce fit, Beth Shammai did not refrain from marrying women from [the daughters of] Beth Hillel, nor did Beth Hillel refrain from marrying women from [the daughters of] Beth Shammai. And in the case of all matters of purity and impurity in respect to which these pronounce pure and these pronounce impure, they did not refrain from preparing foods requiring a condition of purity each by means of [the vessels of] the other.

If a woman was eating terumah, and they came and said to her, “Your husband is dead”, or “He divorced you.” Or, if a slave was eating terumah, and they came and said to him: “Your master is dead”, or “He sold you to an Israelite”, or “He gave you away as a gift”, or “He emancipated you.” So too, if a priest was eating terumah and it became known that he was the son of a divorced woman or a halutzah (a woman released from levirate marriage): Rabbi Eliezer says: they must repay both the value and the fifth. But Rabbi Joshua exempts them [from the added fifth]. If [a priest] was standing and sacrificing on the altar and it became known that he was the son of a divorced woman or a halutzah: Rabbi Eliezer says: all the sacrifices he had offered on the altar are disqualified. But Rabbi Joshua pronounces them valid. If it, however, it became known that he possessed a blemish, his service is disqualified.