Numbers 21:23-25

231But 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 2Jahaz and fought against Israel.

24Then 3Israel 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 4border of the sons of Ammon was 5Jazer.

25Israel took all these cities, and 6Israel lived in all the cities of the Amorites, in Heshbon and in all her 7villages.