וַיִּשְׁכְּנ֨וּ מֵֽחֲוִילָ֜ה עַד־שׁ֗וּר אֲשֶׁר֙ עַל־פְּנֵ֣י מִצְרַ֔יִם בֹּאֲכָ֖ה אַשּׁ֑וּרָה עַל־פְּנֵ֥י כָל־אֶחָ֖יו נָפָֽל׃ (פ)
And they dwelt from Havilah unto Shur that is before Egypt, as thou goest toward Asshur: over against all his brethren he did settle.
Rashi on Genesis
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).
Rashbam on Genesis
THEY CAMPED [LIT.: FELL] ALONGSIDE ALL THEIR KINSMEN. They dwelt, as it is written (Gen. 16:12), "He will dwell alongside all his kinsmen."
Radak on Genesis
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.