1 Samuel 27:8

And David and his men, no longer under the direct observation of the Philistines, went up and invaded the Geshurites and the Gezrites, small nations living south of the Philistine territory, and the Amalekites, the nomadic tribes whom Saul had almost destroyed, 1 Samuel 15:7; for those nations were of old the inhabitants of the land, as thou goest to Shur, even unto the land of Egypt, on the Egyptian border.