Deuteronomy 3:12

“And this land, which we possessed at that time, etc.] Or took possession of, having conquered it; for it still remained in their possession: from Aroer, which is by the river Arnon: on the borders of Moab, from thence as far as Gilead was the land which was taken from Sihon king of Heshbon, (<050236>Deuteronomy 2:36) and half Mount Gilead, and the cities thereof: which were taken from Og king of Bashan, (<050310>Deuteronomy 3:10) gave I unto the Reubenites, and to the Gadites; at their request, on certain conditions to be performed by them, afterwards repeated.”

“this land, which we possessed at that time, from Aroer . . . gave I unto the Reubenites and to the Gadites--The whole territory occupied by Sihon was parcelled out among the pastoral tribes of Reuben and Gad. It extended from the north bank of the Arnon to the south half of mount Gilead--a small mountain ridge, now called Djelaad, about six or seven miles south of the Jabbok, and eight miles in length. The northern portion of Gilead and the rich pasture lands of Bashan--a large province, consisting, with the exception of a few bleak and rocky spots, of strong and fertile soil--was assigned to the half-tribe of Manasseh.”

“3:12-20 See Num 32. 3:12 The tribes of Reuben and Gad had asked Moses to let them settle east of the Jordan rather than in Canaan, and he allowed them to do so (Num 32:1-5). • Aroer: See study note on Deut 2:36.”

“from Aroer: Deu 2:36, Deu 4:48; Num 32:33-38; Jos 12:2-6, Jos 13:8-12, Jos 13:14-28; Kg2 10:33 Deuteronomy 3:13”

“Review of the Distribution of the Conquered Land. - The land which the Israelites had taken belonging to these two kingdoms was given by Moses to the two tribes and a half for their possession, viz., the southern portion from Aroer in the Arnon valley (see at Num 32:34), and half Gilead (as far as the Jabbok: see at Deu 3:10) with its towns, which are enumerated in Jos 13:15-20 and Jos 13:24-28, to the Reubenites and Gadites; and the northern half of Gilead, with the whole of Bashan (i.e., all the region of Argob: see at Deu 3:4, and Num 32:33), to the half-tribe of Manasseh. לכל־הבּשׁן, "as for all Bashan," is in apposition to "all the region of Argob," and the ל simply serves to connect…”