Genesis 25:18

“And they dwelt from Havilah unto Shur, etc.] That is, the posterity of Ishmael, whose country reached from one place to the other; not from India to Chaluza, as the Targums of Jonathan and Jerusalem; but the extent is that vast desert of Arabia, which eastward was called the wilderness of Havilah, and westward the wilderness of Shur; so that they inhabited it from east to west: that [is] before Egypt, as thou goest to Assyria; which last place was over against Egypt, and bordered on that part where lies the way to the land of Assyria: [and] he died in the presence of all his brethren; they being present when he died, or in peace with them, in all prosperity along with them: but since his…”

“DESCENDANTS OF ISHMAEL. Before passing to the line of the promised seed, the historian gives a brief notice of Ishmael, to show that the promises respecting that son of Abraham were fulfilled--first, in the greatness of his posterity (compare Gen 17:20); and, secondly, in their independence. (Gen 25:12-18) he died--rather, "it [their lot] fell" in the presence of his brethren (compare Gen 16:12).”

“25:18 Havilah was a region in north-central Arabia. • Shur was a region between Beersheba and Egypt. • in open hostility toward all their relatives: The wording is close to that of 16:12.”