Commentaire sur La Genèse 25:18

נפל (literally, he fell) means ‘‘he dwelt”, as (Judges 7:12) “Now the Midianites and the Amalekites and all children of the East dwelt (נופלים) in the valley.” Here it says “He fell” and there (16:12) it says “In the presence of all his brethren shall he dwell”. Bui it may be explained thus: before Abraham died it could be said “He would dwell in security: after he died, “he fell” (Genesis Rabbah 62:5).

THEY CAMPED [LIT.: FELL] ALONGSIDE ALL THEIR KINSMEN. They dwelt, as it is written (Gen. 16:12), "He will dwell alongside all his kinsmen."

וישכבו, the descendants of Ishmael mentioned by name in this paragraph resided in different regions extending from Chavilah as far as Shur, as these were the regions which became their ancestral holdings.