1 Samuel 29:6-7

6So Achish summoned David and said to him, “As surely as the Lord lives, you are an honest man, and I am glad to have you serving with me in the army. I have found no fault with you from the day that you first came to me until the present time. But in the opinion of the leaders, you are not reliable.

7So turn and leave in peace. You must not do anything that the leaders of the Philistines consider improper!”