Joshua 13:10

and all the cities of Sihon, king of the Amorites, who reigned in Heshbon, - as far as the boundary of the sons of Ammon;

Numbers 21:24-26

And Israel smote him with the edge of the sword, - and took possession of his land, from Arnon unto Jabbok, unto the sons of Ammon, for strong, was the boundary of the sons of Ammon.

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