(26) And taken all his land . . . --i.e., the land between the Arnon and the Jabbok, as it is explained in the last clause of the verse.

Verse 26. - All his land. This is qualified by what follows: "even unto Arnon" (cf. Judges 11:13-19).

21:21-35 Sihon went with his forces against Israel, out of his own borders, without provocation, and so ran upon his own ruin. The enemies of God's church often perish by the counsels they think most wisely taken. Og, king of Bashan, instead of being warned by the fate of his neighbours, to make peace with Israel, makes war with them, which proves in like manner his destruction. Wicked men do their utmost to secure themselves and their possessions against the judgments of God; but all in vain, when the day comes on which they must fall. God gave Israel success, while Moses was with them, that he might see the beginning of the glorious work, though he must not live to see it finished. This was, in comparison, but as the day of small things, yet it was an earnest of great things. We must prepare for fresh conflicts and enemies. We must make no peace or truce with the powers of darkness, nor even treat with them; nor should we expect any pause in our contest. But, trusting in God, and obeying his commands, we shall be more than conquerors over every enemy.For Heshbon was the city of Sihon the king of the Amorites,.... His royal city, where he kept his palace, where he had resided for some time, and perhaps some of his predecessors; and therefore being now in his possession when taken by the Israelites, they had a good right and title to keep it, and dwell in it: and indeed this is here given as a reason of it:

who had fought against the former king of Moab; either the king that reigned before Balak, or some king of Moab, that reigned formerly, against whom one of the name of Sihon, which might be a common name to the kings of the Amorites, as Pharaoh to the Egyptians, had engaged in war:

and taken all his land out of his hand, even unto Arnon; and had been in the hands of the Amorites some years; and therefore the Moabites had no reason to object to the Israelites dwelling in it, and possessing it, which they had not taken from them, but from the Amorites in a lawful war. And for proof of this, reference is had to the bards and poets of those times, who were the persons that transmitted in verse the history of famous actions to posterity.