Leviticus 20:19-21

Complete Jewish Bible

¹⁹ You are not to have sexual relations with your mother’s sister or your father’s sister; a person who does this has had sexual relations with his close relative; they will bear the consequences of their wrongdoing. ²⁰ If a man goes to bed with his uncle’s wife, he has disgraced his uncle sexually; they will bear the consequences of their sin and die childless. ²¹ If a man takes his brother’s wife, it is uncleanness; he has disgraced his brother sexually; they will be childless.