Familiar Spirits

"The Hebrews were expressly forbidden to engage in any manner in pretended communion with the dead. And the Lord declared to Israel: The soul that turneth after such as have familiar spirits, and after wizards, to go a whoring after them, I will even set My face against that soul, and will cut him off from among his people.Leviticus 20:6
The "familiar spirits" were not the spirits of the dead, but evil angels, the messengers of Satan. Ancient idolatry, which, as we have seen, comprises both worship of the dead and pretended communion with them, is declared by the Bible to have been demon worship. The apostle Paul, in warning his brethren against participating, in any manner, in the idolatry of their heathen neighbors, says, The things which the Gentiles sacrifice, they sacrifice to devils, and not to God, and I would not that ye should have fellowship with devils.
1 Corinthians 10:20.Patriarchs & Prophets p.685,686 E.G.W.