Matthew Henry Commentary Deuteronomy 18:9-14

"When thou art come into the land which Jehovah thy God giveth thee, thou shalt not learn to do after the abominations of those nations. There shall not be found with thee any one that maketh his son or his daughter to pass through the fire, one that useth divination, one that practiseth augury, or an enchanter, or a sorcerer, or a charmer, or a consulter with a familiar spirit, or a wizard, or a necromancer. For whosoever doeth these things is an abomination unto Jehovah: and because of these abominations Jehovah thy God doth drive them out from before thee. Thou shalt be perfect with Jehovah thy God. For these nations, that thou shalt dispossess, hearken unto them that practise augury, and unto diviners; but as for thee, Jehovah thy God hath not suffered thee so to do." — Deuteronomy 18:9-14 (ASV)

Was it possible that a people so blessed with Divine institutions could ever be in any danger of making those whom God had made their captives their teachers? They were in danger; therefore, after many similar cautions, they are charged not to follow the abominations of the nations of Canaan. All reckoning of lucky or unlucky days, all charms for diseases, all amulets or spells to prevent evil, fortune-telling, etc., are here forbidden. These are so wicked as to be a chief cause of the rooting out of the Canaanites.

It is amazing to think that there should be any pretenders of this kind in such a land and day of light as ours. They are mere impostors who blind and cheat their followers.