Leviticus 20:17-19

Common English Bible

¹⁷ If a man marries his sister—his father’s daughter or his mother’s daughter—and they have sexual contact with each other, it is a disgrace. They will be cut off in the sight of their people. Such a man has had sexual contact with his sister; he will be liable to punishment. ¹⁸ If a man sleeps with a woman during her menstrual period and has sexual contact with her, he has exposed the source of her blood flow and she has uncovered the same. Both of them will be cut off from their people. ¹⁹ You must not have sexual contact with your mother’s sister or your father’s sister, because that exposes your own close relative; both of you will be liable to punishment.