Leviticus 20:26-27

20:26 You must be holy to me because I, the Lord, am holy, and I have set you apart from the other peoples to be mine.

Prohibition against Spiritists and Mediums

20:27 “‘A man or woman who has in them a spirit of the dead or a familiar spirit must be put to death. They must pelt them with stones; their blood guilt is on themselves.’”