1 Samuel 27:12--28:2

27:12 So Achish trusted David, thinking to himself, “He is really hated among his own people in Israel! From now on he will be my servant.”

The Witch of Endor

28:1 In those days the Philistines gathered their troops for war in order to fight Israel. Achish said to David, “You should fully understand that you and your men must go with me into the battle.” 28:2 David replied to Achish, “That being the case, you will come to know what your servant can do!” Achish said to David, “Then I will make you my bodyguard from now on.”