Fifteen [categories of] women exempt their rival wives and the rival wives of their rival wives and so on ad infinitum from halitzah and from yibbum. And these are they: his daughter, and the daughter of his daughter, and the daughter of his son, and the daughter of his wife, and the daughter of her son and the daughter of her daughter; (7) His mother-in-law and his mother-in-law’s mother, and his father-in-law’s mother; (10) His maternal sister and his mother’s sister and his wife’s sister (13) And his maternal brother’s wife; and the wife of his brother who died before he was born, (15) And his daughter-in-law. All these exempt their rival wives and the rival wives of their rival wives, and so on, ad infinitum, from halitzah and from yibbum. If any of them died, or made a declaration of refusal, or were divorced, or were found incapable of procreation, their rivals are permitted. And you cannot say of a man’s mother-in-law, or the mother of his mother-in-law and of the mother of his father-in-law that they were found incapable of procreation or that they made a declaration of refusal.

There are six relatives that are more restricted than these, in that they may be married only to strangers, marriage with their rivals is permitted: his mother and his father’s wife, his father’s sister, his paternal sister, his father’s brother’s wife and his paternal brother’s wife.

Beth Shammai permits the rival wives to the surviving brothers, and Beth Hillel prohibits them. If they perform the halitzah, Beth Shammai disqualifies them from marrying a priest, and Beth Hillel makes the eligible. If they performed yibbum, Beth Shammai makes them eligible [to marry a priest], and Beth Hillel disqualifies them. Though these forbid and these permit, and these disqualify and these make eligible, Beth Shammai did not refrain from marrying women from [the families of] Beth Hillel, nor did Beth Hillel [refrain from marrying women] from [the families of] Beth Shammai. [With regard to] purity and impurity, which these declare pure and the others declare impure, neither of them refrained from using the utensils of the others for the preparation of food that was ritually clean.