Leviticus 20:19-21

New Revised Standard Version, Anglicised Catholic Edition

¹⁹ You shall not uncover the nakedness of your mother’s sister or of your father’s sister, for that is to lay bare one’s own flesh; they shall be subject to punishment. ²⁰ If a man lies with his uncle’s wife, he has uncovered his uncle’s nakedness; they shall be subject to punishment; they shall die childless. ²¹ If a man takes his brother’s wife, it is impurity; he has uncovered his brother’s nakedness; they shall be childless.