Numbers 21:22-26

“Let me pass through your land. We will not turn off into field or vineyard; we will not drink water from wells. We will go by the king’s road until we have passed through your border.”

But Sihon would not permit Israel to pass through his border. Instead, Sihon gathered all his people and went out against Israel in the wilderness, and came to Jahaz and fought against Israel.

Then Israel struck him with the edge of the sword, and took possession of his land from the Arnon to the Jabbok, as far as the sons of Ammon; for the border of the sons of Ammon was Jazer.

Israel took all these cities, and Israel lived in all the cities of the Amorites, in Heshbon and in all her villages.

For Heshbon was the city of Sihon, king of the Amorites, who had fought against the former king of Moab and had taken all his land out of his hand, as far as the Arnon.