1 Samuel 29:9-11

But Achish insisted, “As far as I’m concerned, you’re as perfect as an angel of God. But the Philistine commanders are afraid to have you with them in the battle. Now get up early in the morning, and leave with your men as soon as it gets light.” So David and his men headed back into the land of the Philistines, while the Philistine army went on to Jezreel.