1 Samuel 28:5

David said to Achish, “Therefore you will know what your servant can do.”

Achish said to David, “Therefore I will make you my bodyguard forever.”

Now Samuel was dead, and all Israel had mourned for him and buried him in Ramah, even in his own city. Saul had sent away those who had familiar spirits and the wizards out of the land.

The Philistines gathered themselves together, and came and encamped in Shunem; and Saul gathered all Israel together, and they encamped in Gilboa.

When Saul inquired of the LORD, the LORD didn’t answer him by dreams, by Urim, or by prophets.

Then Saul said to his servants, “Seek for me a woman who has a familiar spirit, that I may go to her and inquire of her.”

His servants said to him, “Behold, there is a woman who has a familiar spirit at Endor.”

Saul disguised himself and put on other clothing, and went, he and two men with him, and they came to the woman by night. Then he said, “Please consult for me by the familiar spirit, and bring me up whomever I shall name to you.”