Leviticus 20:20-22

²⁰If a man lies with his uncle’s wife, he has uncovered his uncle’s nakedness. They shall bear their sin. They shall die childless.

²¹“‘If a man takes his brother’s wife, it is an impurity. He has uncovered his brother’s nakedness. They shall be childless.

²²“‘You shall therefore keep all my statutes and all my ordinances, and do them, that the land where I am bringing you to dwell may not vomit you out.