Joshua 12:2

Sihon king of the Amorites, who dwelt in Heshbon, and ruled from Aroer, which is upon the bank of the river Arnon, and from the middle of the river, and from half Gilead, even unto the river Jabbok, which is the border of the children of Ammon;

The verse stands within a catalogue of the kings and territories defeated in battle before the apportionment of the land. It belongs to the record of the dividing and settling of the Promised Land among the tribes. That larger section exposes Israel's lack of faith and slowness to possess what was given, yet it closes with the assurance that every good thing God had promised was fulfilled.