Numbers 21:25-27

²⁵And Israel took all these cities, and Israel dwelt in all the cities of the Amorites, at Heshbon, and in all its dependent villages.

²⁶For Heshbon was the city of Sihon the king of the Amorites; and he had fought against the former king of Moab, and had taken all his land out of his hand, even unto the Arnon.

²⁷Therefore the poets say, Come to Heshbon; let the city of Sihon be built and established.