So at that time we took possession of this land. To the Reubenites and Gadites I gave the land beyond Aroer along the Arnon Valley, and half the hill country of Gilead, along with its cities.
12. And this land, which we possessed at that time. In this passage Moses confirms his decision, that the possession of the country beyond Jordan should be insured to the Reubenites and Gadites, and half the tribe of Manasseh. For, since it had fallen to them exceptionally, the matter might be brought into controversy with posterity.
Having shown how this country which they were now in was conquered, in these verses he shows how it was settled upon the Reubenites, Gadites, and half the tribe of Manasseh, which we had the story of before, Num. 32. Here is the rehearsal. 1.
Commenting on Deuteronomy 3:12-20
And this land, which we possessed at that time,.... 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, Deu 2:36.