1 Samuel 27:3

And David dwelt with Achish at Gath. — His reception by the Philistines seems to have been most kindly. There was a wide difference between the circumstances of this and his former visit to Gath. Then he was a fugitive, almost unattended; now he was at the head of an army of trained and devoted soldiers. Such a guest might be of the greatest service to the Philistines in their perpetual wars with Saul, with whom David would now be considered to have finally broken off all relations, seeing he had sought a home and shelter among the most bitter of his foes.