Numbers 21:25-27

²⁵And Israel took all these cities: and Israel dwelt in all the cities of the Amorites, in Heshbon, and in all the villages thereof.

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

²⁷Wherefore they that speak in proverbs say, Come into Heshbon, let the city of Sihon be built and prepared: