Numbers 21:27-29 NIV

27 That is why the poets say: “Come to Heshbon and let it be rebuilt; let Sihon’s city be restored.
28 “Fire went out from Heshbon, a blaze from the city of Sihon. It consumed Ar of Moab, the citizens of Arnon’s heights.

References for Numbers 21:28

29 Woe to you, Moab! You are destroyed, people of Chemosh! He has given up his sons as fugitives and his daughters as captives to Sihon king of the Amorites.