Leviticus 20:18; Leviticus 20:19

Leviticus 20:18

18 “ ‘If a man has sexual relations with a woman during her monthly period, he has exposed the source of her flow, and she has also uncovered it. Both of them are to be cut off from their people.

Leviticus 20:19

19 “ ‘Do not have sexual relations with the sister of either your mother or your father, for that would dishonor a close relative; both of you would be held responsible.