Joshua 13:10

and all the cities of Sihon, king of the Amorites, who reigned in Heshbon, unto the borders of the sons of Ammon;

Numbers 21:24-26

And Israel smote him with the edge of the sword and possessed his land from Arnon unto Jabbok, even unto the sons of Ammon, for the border of the sons of Ammon was strong.

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