Thus saith the Lord GOD; Because that Moab and Seir do say, Behold, the house of Judah is like unto all the heathen;

Wesley's Notes

25:8 Seir - The seed of Esau, the Edomites. Seir was the mountain where they first planted themselves. Is like - Are no more a select people than others.

Scofield Reference Notes

[1] Thus

The prophecies upon Gentile powers, extending to Ezek 32:32 have doubtless had partial fulfilments of which history and the present condition of those cities and countries bear witness, but the mention of the day of Jehovah Ezek 30:3 makes it evident that a fulfilment in the final sense is still future. See "Day of Jehovah" Isa 2:10-22. See Scofield Note: "Rev 19:19". Also "Armageddon" Rev 16:14. See Scofield Note: "Rev 19:17". Those countries are once more to be the battle ground of the nations.

Jamieson-Fausset-Brown Bible Commentary

8. Moab, Seir, and Ammon were contiguous countries, stretching in one line from Gilead on the north to the Red Sea. They therefore naturally acted in concert, and in joint hostility to Judea.

Judah is like . all . heathen-The Jews fare no better than others: it is of no use to them to serve Jehovah, who, they say, is the only true God.

Matthew Henry's Concise Commentary

25:8-17 Though one event seem to the righteous and wicked, it is vastly different. Those who glory in any other defence and protection than the Divine power, providence, and promise, will, sooner or later, be ashamed of their glorying. Those who will not leave it to God to take vengeance for them, may expect that he will take vengeance on them. The equity of the Lord's judgments is to be observed, when he not only avenges injuries upon those that did them, but by those against whom they were done. Those who treasure up old hatred, and watch for the opportunity of manifesting it, are treasuring up for themselves wrath against the day of wrath.