Numbers 21:26

23 And Sihon would not let Israel go through his land; but got all his people together and went out against Israel into the waste land, as far as Jahaz, to make war on Israel.

24 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 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.

27 So the makers of wise sayings say, Come to Heshbon, building up the town of Sihon and making it strong:

28 For a fire has gone out of Heshbon, a flame from the town of Sihon: for the destruction of Ar in Moab, and the lords of the high places of the Arnon.

29 Sorrow is yours, O Moab! Destruction is your fate, O people of Chemosh: his sons have gone in flight, and his daughters are prisoners, in the hands of Sihon, king of the Amorites.