Leviticus 20:6-8

‘As for the person who turns to mediums [who consult the dead] or to spiritists, to play the prostitute after them, I shall set My face against that person and will cut him off from his people [excluding him from the atonement made for them]. [Is 54:5] You shall consecrate yourselves therefore, and be holy; for I am the LORD your God. You shall keep My statutes and do them. I am the LORD who sanctifies you.