Verse 21. - And Israel sent messengers unto Sihon. The narrative here returns to the point of time when the Israelites first reached the Upper Arnon, the boundary stream of the kingdom of Sihon (see on verse 13, and cf. Deuteronomy 2:24-37). The list of stations in the preceding verses may probably have been copied out of some official record; it may be considered as marking the movements of the tabernacle with Eleazar and the Levites and the mass of the non-combatant population. In the mean time the armies of Israel were engaged in victorious enterprises which took them far afield. King of the Amorites. The Amorites were not akin to the Hebrews, as the Edomites, Moabites, and Ammonites were, who all claimed descent from Terah. They were of the Canaanitish stock (Genesis 10:16), and indeed the name Amorite often appears as synonymous with Canaanite in its larger sense (Deuteronomy 1:7, 19, 27, etc.). If at one time they are mentioned side by side with five or six other tribes of the same stock (Exodus 34:11), yet at another they seem to be so much the representative race that "the Ammorite" stands for the inhabitants of Canaan in general whom Israel was commissioned to oust on account of his iniquity (Genesis 15:16). It is not, therefore, possible to draw any certain distinction between the Amorites of Sihon's kingdom and the mass of the Canaanites on the other side Jordan. Both Sihon and his people appear as intruders in this region, having come down perhaps from the northern parts of Palestine, and having but recently (it would seem) wrested from the king of Moab all his territory north of Arnon. It was the fact of the Amorites being found here which led to the conquest and settlement of the trans-Jordanic territory. That territory was not apparently included in the original gift (compare Numbers 34:2-12 with Genesis 10:19 and Genesis 15:19-21), but since the Amorite had possessed himself of it, it must pass with all the rest of his habitation to the chosen people.

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.And Israel sent messengers unto Sihon king of the Amorites,.... Who were one of the nations of the Canaanites, and a principal and powerful one, and who were devoted to destruction, and their land designed for the people of Israel; see Genesis 15:16, at this time Sihon was their king, to whom Moses, in the name of Israel, sent a very peaceable message from the wilderness of Kedemoth, which lay near his country, Deuteronomy 2:26,

saying; as follows.