Parallel
Numbers 21:24
Brenton's English Septuagint · Berean Standard Bible
And Israel smote him with the slaughter of the sword, and they became possessors of his land, from Arnon to Jaboc, as far as the children of Amman, for Jazer is the borders of the children of Amman.
And Israel put him to the sword and took possession of his land, from the Arnon to the Jabbok—but only up to the border of the Ammonites, because it was fortified (note: Or because the territory was rugged; literally because it was strong).