Joshua 13:10

and all the cities of Sihon king of the Amorites, who reigned in Heshbon, as far as the border of the Ammonites;

Numbers 21:24-26

Then Israel struck the king of the Amorites with the edge of the sword and took possession of his land from the Arnon to the Jabbok, as far as the Ammonites, for the boundary of the Ammonites was strong.

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