1 Samuel 28:1-6

Now it came about in those days that the Philistines gathered their armed camps for war, to fight against Israel. And Achish said to David, “Know assuredly that you will go out with me in the camp, you and your men.” David said to Achish, “Very well, you shall know what your servant can do.” So Achish said to David, “Very well, I will make you my bodyguard for life.” Now Samuel was dead, and all Israel had lamented him and buried him in Ramah, his own city. And Saul had removed from the land those who were mediums and spiritists. So the Philistines gathered together and came and camped in Shunem; and Saul gathered all Israel together and they camped in Gilboa. When Saul saw the camp of the Philistines, he was afraid and his heart trembled greatly. When Saul inquired of the LORD, the LORD did not answer him, either by dreams or by Urim or by prophets.