Joshua 13:10

And all the cities of Sihon king of the Amorites, who reigned in Heshbon, as far as the border of the children of Ammon;

Numbers 21:24-26

And Israel struck him with the edge of the sword, and possessed his land from Arnon unto Jabbok, even unto the children of Ammon: for the border of the children of Ammon was fortified.

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