Numbers 21:24

From Arnon — Or, which reached from Arnon; and so here is a description or limitation of Sihon's conquest and kingdom, that is, extended only from Arnon, unto the children of Ammon; and then the following words, for the border of the children of Ammon was strong, come in very fitly, not as a reason why the Israelites did not conquer the Ammonites, for they were absolutely forbidden to meddle with them, Deuteronomy 3:8, but as a reason why Sihon could not enlarge his conquests to the Ammonites, as he had done to the Moabites. Jabbok — A river by which the countries of Ammon and Moab were in part bounded and divided. Strong — Either by the advantage of the river, or by their strong holds in their frontiers.