Leviticus 20:21-25

If there is a man who takes his brother’s wife, it is detestable; he has uncovered his brother’s nakedness. They will be childless.

‘You are therefore to keep all My statutes and all My ordinances, and do them, so that the land to which I am bringing you to live will not vomit you out.

Furthermore, you shall not follow the customs of the nation which I am going to drive out before you, because they did all these things; therefore I have felt disgust for them.

So I have said to you, “You are to take possession of their land, and I Myself will give it to you to possess, a land flowing with milk and honey.” I am the Lord your God, who has singled you out from the peoples.

You are therefore to make a distinction between the clean animal and the unclean, and between the unclean bird and the clean; and you shall not make yourselves detestable by animal or by bird, or by anything that crawls on the ground, which I have distinguished for you as unclean.