Leviticus 20:17-21

17"If a man takes his sister, a daughter of his father or a daughter of his mother, and sees her nakedness, and she sees his nakedness, it is a disgrace, and they shall be cut off in the sight of the children of their people. He has uncovered his sister's nakedness, and he shall bear his iniquity.

18If a man lies with a woman during her menstrual period and uncovers her nakedness, he has made naked her fountain, and she has uncovered the fountain of her blood. Both of them shall be cut off from among their people.

19You shall not uncover the nakedness of your mother's sister or of your father's sister, for that is to make naked one's relative; they shall bear their iniquity.

20If a man lies with his uncle's wife, he has uncovered his uncle's nakedness; they shall bear their sin; they shall die childless.

21If a man takes his brother's wife, it is impurity. He has uncovered his brother's nakedness; they shall be childless.