Deuteronomy 18:9-12
When you come to the land that the Lord your God is giving you, never learn the disgusting practices of those nations.  You must never sacrifice your sons or daughters by burning them alive, practice black magic, be a fortuneteller, witch, or sorcerer,  cast spells, ask ghosts or spirits for help, or consult the dead.  Whoever does these things is disgusting to the Lord. The Lord your God is forcing these nations out of your way because of their disgusting practices.