1 Samuel 29:8-9

8David said to King Achish, ‘What have I done that is wrong? You say that you have found nothing wrong with me all the time that I have been with you. You are my master and king. So why should I not go with you to fight your enemies?’

9Achish replied, ‘I believe that you are as good as an angel from God. But the Philistine leaders have said, “David must not go with us to fight the battle.”