He came to Jahaz, and fought against Israel— Jahaz was a city either in the country of Moab, or near it, as appears from Isaiah 15:4.Jeremiah 48:21. There the Amorites fell upon the Israelites when they had given them no provocation, and consequently were the first aggressors: so that the just ground of the war was, not their denying the Israelites a passage through the country, as Grotius thinks, (see on ch. Numbers 21:20-21.) but because they fell upon the Israelites unjustly, and were of the seven nations condemned by God to that destruction which now overwhelmed them, Deuteronomy 2:33-34.
Related Commentaries of Numbers 21:23
Numbers 21:23
23 And Sihon would not suffer Israel to pass through his border: but Sihon gathered all his people together, and went out against Israel into the wilderness: and he came to Jahaz, and fought against Israel.