Numbers 21:24-28

Then Israel struck him with the edge of the sword, and took possession of his land from the Arnon to the Jabbok, as far as the sons of Ammon; for the border of the sons of Ammon was Jazer.

Israel took all these cities, and Israel lived in all the cities of the Amorites, in Heshbon and in all her villages.

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

For that reason those who use proverbs say, “Come to Heshbon! Let it be built! So let the city of Sihon be established.

“For a fire spread from Heshbon, A flame from the town of Sihon; It devoured Ar of Moab, The dominant heights of the Arnon.