The Scriptures condemn mediumship and Spiritism in these severe terms:
A man or woman who is a medium or spiritist among you must be put to death. You are to stone them; their blood will be on their own heads (Leviticus 20:27 NIV).
There shall not be found among you anyone who makes his son or his daughter pass through the fire, or one who practices witchcraft, or a soothsayer, or one who interprets omens, or a sorcerer, or one who conjures spells, or a medium, or a spiritist, or one who calls up the dead (Deuteronomy 18:10-11 NKJV).