Leviticus 18:14-15
18:14 You must not expose the nakedness of your father’s brother; you must not approach his wife to have sexual intercourse with her. She is your aunt.
18:15 You must not have sexual intercourse with your daughter-in-law; she is your son’s wife. You must not have intercourse with her.
Leviticus 18:18
18:18 You must not take a woman in marriage and then marry her sister as a rival wife while she is still alive, to have sexual intercourse with her.
Leviticus 20:10
20:10 If a man commits adultery with his neighbor’s wife, both the adulterer and the adulteress must be put to death.
Leviticus 20:21
20:21 If a man has sexual intercourse with his brother’s wife, it is indecency. He has exposed his brother’s nakedness; they will be childless.
Leviticus 21:14
21:14 He must not marry a widow, a divorced woman, or one profaned by prostitution; he may only take a virgin from his people as a wife.