Leviticus 20:19-21

New Catholic Bible

¹⁹ You shall not uncover the nakedness of your mother’s sister or your father’s sister, for someone who uncovers a close relation shall bear his guilt. ²⁰ A man shall not have sex with his uncle’s wife, for he shall have laid bare his uncle’s nakedness. They shall bear their guilt and die childless. ²¹ It is unclean for a man to marry his brother’s wife for he shall have uncovered his brother’s nakedness. They shall be childless.