Deuteronomy 2:24

2:24 Get up, make your way across Wadi Arnon. Look! I have already delivered over to you Sihon the Amorite, king of Heshbon, ¹  and his land. Go ahead! Take it! Engage him in war!

Deuteronomy 3:12

Distribution of the Transjordanian Allotments

3:12 This is the land we brought under our control at that time: The territory extending from Aroer ²  by the Wadi Arnon and half the Gilead hill country with its cities I gave to the Reubenites and Gadites. ³ 

[2:24]  ¹ sn Heshbon is the name of a prominent site (now Tell Hesba„n, about 7.5 mi [12 km] south southwest of Amman, Jordan). Sihon made it his capital after having driven Moab from the area and forced them south to the Arnon (Num 21:26-30). Heshbon is also mentioned in Deut 1:4.

[3:12]  ² tn The words “the territory extending” are not in the Hebrew text; they are supplied in the translation for stylistic reasons.

[3:12]  ³ sn Reubenites and Gadites. By the time of Moses’ address the tribes of Reuben, Gad, and Manasseh had already been granted permission to settle in the Transjordan, provided they helped the other tribes subdue the occupants of Canaan (cf. Num 32:28-42).