Numbers 21:21-26

The Israelites sent ambassadors to King Sihon of the Amorites with this message: “Let us travel through your land. We will be careful not to go through your fields and vineyards. We won’t even drink water from your wells. We will stay on the king’s road until we have passed through your territory.” But King Sihon refused to let them cross his territory. Instead, he mobilized his entire army and attacked Israel in the wilderness, engaging them in battle at Jahaz. But the Israelites slaughtered them with their swords and occupied their land from the Arnon River to the Jabbok River. They went only as far as the Ammonite border because the boundary of the Ammonites was fortified. So Israel captured all the towns of the Amorites and settled in them, including the city of Heshbon and its surrounding villages. Heshbon had been the capital of King Sihon of the Amorites. He had defeated a former Moabite king and seized all his land as far as the Arnon River.