1 Samuel 29:4-5
4-5Angry with Achish, the Philistine officers said, "Send this man back to where he came from. Let him stick to his normal duties. He's not going into battle with us. He'd switch sides in the middle of the fight! What better chance to get back in favor with his master than by stabbing us in the back! Isn't this the same David they celebrate at their parties, singing,
Saul kills by the thousand,
David by the ten thousand!"
6-7So Achish had to send for David and tell him, "As God lives, you've been a trusty ally—excellent in all the ways you have worked with me, beyond reproach in the ways you have conducted yourself. But the warlords don't see it that way. So it's best that you leave peacefully, now. It's not worth it, displeasing the Philistine warlords."