Easton's Bible Dictionary (1897)
A tribe that dwelt in Arabia Petraea, between the Dead Sea and the Red Sea. They were not the descendants of Amalek, the son of Eliphaz, for they existed in the days of Abraham (Gen. 14:7). They were probably a tribe that migrated from the shores of the Persian Gulf and settled in Arabia. from Havilah until thou comest to Shur” (Num. 13:29; 1 Sam. 15:7). They were a pastoral, and hence a nomadic race. Their kings bore the hereditary name of Agag (Num. 24:7; 1 Sam. 15:8).
They attempted to stop the Israelites when they marched through their territory (Deut. 25:18), attacking them at Rephidim (Ex. 17:8-13; comp. Deut. 25:17; 1 Sam. 15:2). They afterwards attacked the Israelites at Hormah (Num. 14:45). We read of them subsequently as in league with the Moabites (Judg. 3:13) and the Midianites (Judg. 6:3). Saul finally desolated their territory and destroyed their power (1 Sam. 14:48; 15:3), and David recovered booty from them (1 Sam. 30:18-20).