21:24 And Israel smote him with the edge of the sword, and possessed his land from Arnon unto {h} Jabbok, even unto the children of Ammon: for the border of the children of Ammon [was] {i} strong.
(h) The river.
(i) For the people were tall and strong like giants; De 2:20.
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, Deu 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.
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.
