וּבִימֵ֣י שָׁא֗וּל עָשׂ֤וּ מִלְחָמָה֙ עִם־הַֽהַגְרִאִ֔ים וַֽיִּפְּל֖וּ בְּיָדָ֑ם וַיֵּשְׁבוּ֙ בְּאָ֣הֳלֵיהֶ֔ם עַֽל־כָּל־פְּנֵ֖י מִזְרָ֥ח לַגִּלְעָֽד׃ (פ)
And in the days of Saul they made war with the Hagrites, who fell by their hand; and they dwelt in their tents throughout all the land east of Gilead.
Rashi on I Chronicles
with the Hagarites with the Ishmaelites, and by their mother’s name he calls them Hagarites, because they were the sons of Hagar.
Rashi on I Chronicles
and they dwelt in their tents for it is the custom of the Arabs to dwell in tents.