Leviticus 20:21 in the King James Version
And if a man shall take his brother’s wife, it is an unclean thing: he hath uncovered his brother’s nakedness; they shall be childless.
Context
20 If 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.