I Samuel 29:9-11

Then Achish answered and said to David, “I know that you are as good in my sight as an angel of God; nevertheless the princes of the Philistines have said, ‘He shall not go up with us to the battle.’ Now therefore, rise early in the morning with your master’s servants who have come with you. And as soon as you are up early in the morning and have light, depart.” So David and his men rose early to depart in the morning, to return to the land of the Philistines. And the Philistines went up to Jezreel.