Leviticus 20:24-27

But I have said to you, “You shall inherit their land, and I will give it to you to possess, a land flowing with milk and honey.” I am the LORD your God, who has separated you from the peoples. You shall therefore distinguish between clean animals and unclean, between unclean birds and clean, and you shall not make yourselves abominable by beast or by bird, or by any kind of living thing that creeps on the ground, which I have separated from you as unclean. And you shall be holy to Me, for I the LORD am holy, and have separated you from the peoples, that you should be Mine. ‘A man or a woman who is a medium, or who has familiar spirits, shall surely be put to death; they shall stone them with stones. Their blood shall be upon them.’ ”