1 Samuel 29:3-5

3Then said the princes of the Philistines, What do these Hebrews here ? And Achish said to the princes of the Philistines, Is not this David, the servant of Saul the king of Israel, who hath been with me these days, or these years, and I have found no fault in him since he fell to me to this day? 4And the princes of the Philistines were angry with him; and the princes of the Philistines said to him, Make this fellow return, that he may go again to his place which thou hast appointed him, and let him not go down with us to battle, lest in the battle he should be an adversary to us: for how should he reconcile himself to his master? should it not be with the heads of these men? 5Is not this David, of whom they sang one to another in dances, saying, Saul slew his thousands, and David his ten thousands?