1 Samuel 29:6-7

6So Achish called David to come to him. He said, ‘As surely as the Lord lives, I know that I can trust you. I would like you to go with me to fight the battle. Since the first day that you came to me, I have never found anything wrong with you. But the other leaders do not trust you.

7So return to your home and have peace in your mind. Do not do anything that will make the other Philistine leaders angry.’