Leviticus 18:15-18

¹⁵Thou shalt not show the filthhood of thy son’s wife, for she is the wife of thy son, neither thou shalt discover her shame; and no man take his brother’s wife.

¹⁶Thou shalt not show the filth-hood of thy brother’s wife, for it is the filthhood of thy brother.

¹⁷Thou shalt not show the filthhood of a woman, and of her daughter; thou shalt not take the daughter of her son, and the daughter of her daughter, that thou show her shame; they be the flesh of her, and such lechery is incest, that is, lechery of them that be kin.

¹⁸Thou shalt not take the sister of thy wife, to anguish of her, neither thou shalt show her filthhood, while thy wife liveth yet.