1 Samuel 28:3-9

3Now Samuel was dead, and all Israel had lamented him, and buried him in Ramah, even in his own city. And Saul had put away those that had familiar spirits, and the wizards, out of the land. 4And the Philistines gathered themselves together, and came and encamped in Shunem: and Saul gathered all Israel together, and they encamped in Gilboa. 5And when Saul saw the host of the Philistines, he was afraid, and his heart trembled greatly. 6And when Saul inquired of Jehovah, Jehovah answered him not, neither by dreams, nor by Urim, nor by prophets. 7Then said Saul unto his servants, Seek me a woman that hath a familiar spirit, that I may go to her, and inquire of her. And his servants said to him, Behold, there is a woman that hath a familiar spirit at En-dor.

8And Saul disguised himself, and put on other raiment, and went, he and two men with him, and they came to the woman by night: and he said, Divine unto me, I pray thee, by the familiar spirit, and bring me up whomsoever I shall name unto thee. 9And the woman said unto him, Behold, thou knowest what Saul hath done, how he hath cut off those that have familiar spirits, and the wizards, out of the land: wherefore then layest thou a snare for my life, to cause me to die?