Matthew Poole and continuators on Jeremiah 25:21

21 Edom , and Moab, and the children of Ammon .

The Edomites were the posterity of Esau the Son of Isaac, to whom God had given a Land which they inherited, and he would not suffer the Israelites to make their way through them by force, when they denyed them a passage through their Country, now he threatens their ruine, as also chap. 49.7. and Obadiahs prophesie was against them where their triumphing in the Captivity of the Jews, is mentioned as one thing that had provoked God against them.

The Moabites and Ammonites were descended from Lot, chap. 48. is an entire prophesie against Moab, they had lived in long prosperity as appears there ver. 12. so had the Ammonites against whom also Ieremiah prophesied particularly, chap. 49.1. to the 7.