'Spirits' in the Bible

Now Samuel was dead, and all Israel, after weeping for him, had put his body in its last resting-place in Ramah, his town. And Saul had put away from the land all those who had control of spirits and who made use of secret arts.

And the woman said to him, But you have knowledge of what Saul has done, how he has put away out of the land those who have control of spirits and the users of secret arts: why would you, by a trick, put me in danger of death?