Joshua 13:10

and all the cities of Sihon king of the Amorite, who reigned in Heshbon, unto the border of the Bene-Ammon,

Numbers 21:24-26

And Israel smiteth him by the mouth of the sword, and possesseth his land from Arnon unto Jabbok -- unto the sons of Ammon; for the border of the sons of Ammon is strong.

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