Leviticus 20:6-7, 27

‘And the person who turns to mediums and familiar spirits, to prostitute himself with them, I will set My face against that person and cut him off from his people. Consecrate yourselves therefore, and be holy, for I am the LORD your God.

‘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.’ ”