Leviticus 20:17-21

17‘1If there is a man who takes his sister, his father’s daughter or his mother’s daughter, so that he sees her nakedness and she sees his nakedness, it is a disgrace; and they shall be cut off in the sight of the sons of their people. He has uncovered his sister’s nakedness; he bears his guilt. 182If there is a man who sleeps with a menstruous woman and uncovers her nakedness, he has exposed her flow, and she has uncovered the flow of her blood; so both of them shall be cut off from among their people. 193You shall also not uncover the nakedness of your mother’s sister or of your father’s sister, for such a one has uncovered his 4blood relative; they will bear their guilt. 205If there is a man who sleeps with his uncle’s wife, he has uncovered his uncle’s nakedness; they will bear their sin. They will die childless. 216If there is a man who takes his brother’s wife, it is 7detestable; he has uncovered his brother’s nakedness. They will be childless.