Numbers 21
24 Ref But Israel overcame him, and took all his land from the Arnon to the Jabbok, as far as the country of the children of Ammon, for the country of the children of Ammon was strongly armed.
25 Ref And Israel took all their towns, living in Heshbon and all the towns and small places of the Amorites.
26 For Heshbon was the town of Sihon, king of the Amorites, who had made war against an earlier king of Moab and taken from him all his land as far as the Arnon.