1 Samuel 30:15-16

15Then David said to him, “Will you take me down to this band [of raiders]?” And he said, “Swear to me by God that you will not kill me or turn me over to the hand of my master, and I will bring you down to this band.”

16When he brought David down, the Amalekites had disbanded and spread over all the land, eating and drinking and dancing because of all the great spoil they had taken from the land of the Philistines and from the land of Judah.