1 Samuel 27:2

And David arose, and he passed over with the six hundred men that were with him, whose number had remained unchanged in recent years, unto Achish, the son of Maoch, king of Gath, evidently the same man with whom he sought refuge a number of years before, 1 Samuel 21:10, who by this time, however, must have been convinced that David was no longer an ally of Saul.