Leviticus 10:31

Regard not them that have familiar spirits, neither seek after wizards to be defiled by them; literally: "Do not turn to the spirits of the dead, and after the spirits of soothsaying do not follow. " I am the Lord, your God. All intercourse with conjurors of the dead and with wizards was equivalent to desecration of the holy relation with God, "The chief means used by both these classes of persons was the consulting with the spirits of the departed. While this furnishes an incidental testimony all along to the belief of the Israelites in the life beyond the grave, it is self-evident that all such attempts to secure knowledge which God has not put in the power of living man to acquire are a resistance to His will, and a chafing against the barriers He has imposed. It is remarkable that such attempts should have been persisted in through all ages and in all lands. " (Gardiner.)