Leviticus 20:6-7, 27

‘As for the person who turns to mediums and to spiritists, to play the harlot after them, I will also set My face against that person and will cut him off from among his people. You shall consecrate yourselves therefore and be holy, for I am the LORD your God.

‘Now a man or a woman who is a medium or a spiritist shall surely be put to death. They shall be stoned with stones, their bloodguiltiness is upon them.’ ”