We are warned by Yahweh not to call on familiar spirits. Seeking to commune with any other spirit being besides Yahweh is strictly forbidden. Yahweh has commanded that all worship must go to Him. He is zealous for His people and will not allow them to commit idolatry in such wicked ways. Dr. E.W. Bullinger in his Companion Bible says that these familiar spirits are evil spirits impersonating human beings.
Ghosts are nothing more than evil spirits trying to confuse mankind.
Yahweh says that when a person dies that their spirit returns to Him and all their thoughts perish in the grave. Our spirit is our life source that Yahweh has given to us. Many people today consult psychics, fortunetellers, astrology and other such spiritualism hoping that they can obtain the answers to life, but they do not realize that they are actually calling on Satan's spirit realm. Many who play with ouija boards are ignorant of the fact that they are involving themselves in the spirits of darkness. Yahweh's people are to be pure from all evil worship.