Leviticus 20:6, 27

6 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.

27 ‘A man or woman who is a medium [who pretends to consult the dead] or who is a spiritist shall most certainly be put to death, and be stoned with stones; their blood is on them.’”