1 Samuel 29:3

Then said the princes of the Philistines, What do these Hebrews here? They may have remembered, from an earlier campaign, that the Israelites in their own army had turned against them and helped to destroy them, 1 Samuel 14:21, or they may have been particularly suspicious of David. And Achish said unto the princes of the Philistines, Is not this David, the servant of Saul, the king of Israel, thereby alluding to Saul's enmity toward him, which hath been with me these days, or these years, our expression being "a year and a day," and I have found no fault in him since he fell unto me unto this day? He had found nothing which would cause him to suspect his loyalty to the Philistine cause.