Leviticus 20:6-7, 27

“I will also turn against those who commit spiritual prostitution by putting their trust in mediums or in those who consult the spirits of the dead. I will cut them off from the community. So set yourselves apart to be holy, for I am the LORD your God.

“Men and women among you who act as mediums or who consult the spirits of the dead must be put to death by stoning. They are guilty of a capital offense.”