Leviticus 20:21

18 "'If a man lies with a woman having her monthly period, and uncovers her nakedness; he has made naked her fountain, and she has uncovered the fountain of her blood: and both of them shall be cut off from among their people.

19 "'You shall not uncover the nakedness of your mother's sister, nor of your father's sister; for he has made naked his close relative: they shall bear their iniquity.

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.

23 You shall not walk in the customs of the nation, which I am casting out before you: for they did all these things, and therefore I abhorred them.

24 But I have said to you, "You shall inherit their land, and I will give it to you to possess it, a land flowing with milk and honey." I am the Lord your God, who has separated you from the peoples.