So it came to pass, when all the men of war were consumed and dead from among the people,

Jamieson-Fausset-Brown Bible Commentary

16. all the men of war were consumed and dead from among the people-The outbreak at Kadesh on the false report of the spies had been the occasion of the fatal decree by which God doomed the whole grown-up population to die in the wilderness [Nu 14:29]; but that outbreak only filled up the measure of their iniquities. For that generation, though not universally abandoned to heathenish and idolatrous practices, yet had all along displayed a fearful amount of ungodliness in the desert, which this history only hints at obscurely, but which is expressly asserted elsewhere (Eze 20:25, 26; Am 5:25, 27; Ac 7:42, 43).

Matthew Henry's Concise Commentary

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.