(19) And when thou comest nigh.--Compare Note on Deuteronomy 2:9.

Verse 19. - Over against the children of Ammon. As the Israelites were passing eastward of Moab; when they crossed the Arnon, the Ammonites, whose dwelling was in the wilderness east of the Jordan, would be almost in front of them. The Israelites came over against them after they conquered Sihon (cf. Numbers 21:24).

2:8-23 We have the origin of the Moabites, Edomites, and Ammonites. Moses also gives an instance older than any of these; the Caphtorims drove the Avims out of their country. These revolutions show what uncertain things wordly possessions are. It was so of old, and ever will be so. Families decline, and from them estates are transferred to families that increase; so little continuance is there in these things. This is recorded to encourage the children of Israel. If the providence of God has done this for Moabites and Ammonites, much more would his promise do it for Israel, his peculiar people. Cautions are given not to meddle with Moabites and Ammonites. Even wicked men must not be wronged. God gives and preserves outward blessings to wicked men; these are not the best things, he has better in store for his own children.And when thou comest nigh over against the children of Ammon,.... Who dwelt near the Moabites, and were brethren, both descending from Lot, Genesis 19:37.

distress them not, nor meddle with them: lay no siege to any of their cities, nor provoke them to war, nor engage in battle with them:

for I will not give thee of the land of the children of Ammon any possession; that is, any part of it which was now in their hands; otherwise half their land was given to the tribe of Gad; but then that was what Sihon king of the Amorites had taken from them, and which Israel retook from him, and so possessed it not as the land of the Ammonites, but of the Amorites, one of the seven nations, whose land they were to inherit; see Joshua 13:25,

because I have given it unto the children of Lot for a possession; the Ammonites were the children of Lot by his second daughter, Genesis 19:38.