Deuteronomy 3:12-16

“When we took possession of this land, I gave to the tribes of Reuben and Gad the territory beyond Aroer along the Arnon Gorge, plus half of the hill country of Gilead with its towns. Then I gave the rest of Gilead and all of Bashan—Og’s former kingdom—to the half-tribe of Manasseh. (This entire Argob region of Bashan used to be known as the land of the Rephaites. Jair, a leader from the tribe of Manasseh, conquered the whole Argob region in Bashan, all the way to the border of the Geshurites and Maacathites. Jair renamed this region after himself, calling it the Towns of Jair, as it is still known today.) I gave Gilead to the clan of Makir. But I also gave part of Gilead to the tribes of Reuben and Gad. The area I gave them extended from the middle of the Arnon Gorge in the south to the Jabbok River on the Ammonite frontier.