Numbers 21:14-16, 27-30

That is why the Book of the Wars of the LORD says: “…Zahab in Suphah and the ravines, the Arnon and the slopes of the ravines that lead to the settlement of Ar and lie along the border of Moab.” From there they continued on to Beer, the well where the LORD said to Moses, “Gather the people together and I will give them water.”

That is why the poets say: “Come to Heshbon and let it be rebuilt; let Sihon’s city be restored. “Fire went out from Heshbon, a blaze from the city of Sihon. It consumed Ar of Moab, the citizens of Arnon’s heights. 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. “But we have overthrown them; Heshbon’s dominion has been destroyed all the way to Dibon. We have demolished them as far as Nophah, which extends to Medeba.”