Numbers 21:26-30

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, as far as the Arnon.

27Therefore the ballad singers say, "Come to Heshbon, let it be built; let the city of Sihon be established.

28For fire came out from Heshbon, flame from the city of Sihon. It devoured Ar of Moab, and swallowed the heights of the Arnon.

29Woe to you, O Moab! You are undone, O people of Chemosh! He has made his sons fugitives, and his daughters captives, to an Amorite king, Sihon.

30So we overthrew them; Heshbon, as far as Dibon, perished; and we laid waste as far as Nophah; fire spread as far as Medeba."