1 Samuel 29:3-5

3Then the princes of the Philistines said, “What are these Hebrews doing here?” And Achish said to the princes of the Philistines, “Is this not David, the servant of Saul king of Israel, who has been with me these days, or these years? And to this day I have found no fault in him since he defected to me.”

4But the princes of the Philistines were angry with him; so the princes of the Philistines said to him, “Make this fellow return, that he may go back to the place which you have appointed for him, and do not let him go down with us to battle, lest in the battle he become our adversary. For with what could he reconcile himself to his master, if not with the heads of these men?

5Is this not David, of whom they sang to one another in dances, saying: ‘Saul has slain his thousands, And David his ten thousands’?”