1 Samuel 29:3-5

3And the princes of the Philistines said, What are these Hebrews? And Achish said to the princes of the Philistines, Is not this David, the servant of Saul the king of Israel, who has been with me these days, or these years, and I have found nothing in him since the day of his falling away [to me] to this day?

4But the princes of the Philistines were wroth with him; and the princes of the Philistines said to him, Make the man return, that he may go again to his place where thou hast appointed him, that he go not down with us to the battle, that in the battle he be not an adversary to us; for wherewith should this [fellow] 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 smote his thousands, and David his ten thousands?