Do not turn to mediums or seek out spiritists, for you will be defiled by them. I am the LORD your God (Leviticus 19:31).
Let no one be found among you who sacrifices his son or daughter in the fire, who practices divination or sorcery, interprets omens, engages in witchcraft, or casts spells, or who is a medium or spiritist or who consults the dead…. The nations you will dispossess listen to those who practice sorcery or divination. But as for you, the LORD your God has not permitted you to do so (Deuteronomy 18:10,11,14).
[King Manasseh of Judah] practiced sorcery, divination and witchcraft, and consulted mediums and spiritists. He did much evil in the eyes of the LORD, provoking him to anger (2 Chronicles 33:6).