Leviticus 20:20-22

New Revised Standard Version, Anglicised Catholic Edition

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.

²² You shall keep all my statutes and all my ordinances, and observe them, so that the land to which I bring you to settle in may not vomit you out.