1 Samuel 29:8

8. David said unto Achish Whether David was really anxious to go into battle with the Philistines we have no means of clearly deciding. It is possible that, as the Philistine lords conjectured, he designed to reconcile himself unto Saul by treacherously fighting against Achish and his compeers, and so was much disappointed when he found this opportunity cut off by the suspicions of the lords. In this case, by my lord the king David would have meant Saul, though he knew that Achish would understand him differently. He who had so deliberately lied to the king of Gath on a former occasion (1 Samuel 27:10) was none too good to betray his hospitality and kindness. But Divine Providence arranged for him a more excellent way.