2 Samuel 15:19

Ittai the Gittite— The Jews say, that this Ittai was the son of king Achish, and that, being obliged to quit Gath on account of his attachment to David, he came to offer him his services at the head of the six hundred men mentioned in the foregoing verse, who, as well as himself, had embraced the Jewish religion; an opinion which seems as probable as any other. It is very certain, however, that they came but the day before, 2 Samuel 15:20.; and David, from a principle of generosity, knowing them fatigued with their journey, would have had them turned back, which Ittai gallantly refused to do, vowing that wherever David was, in death or in life, there would he, his servant, be also; 2 Samuel 15:21.