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 4:46

4:46 in the Transjordan, in the valley opposite Beth Peor, in the land of King Sihon of the Amorites, who lived in Heshbon. (It is he whom Moses and the Israelites attacked after they came out of Egypt.

[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.