The polyvalent perspective of the book called Isaiah with respect to the nations raises its head again in the broad horizon celebrated by the hymn that is the book’s twenty-fifth chapter.
The first five verses appear to present a kind of conversion narrative in connection with ‘strong peoples’ and ‘cities of ruthless nations’ who seem to have been moved to their turning by YHWH’s care for the poor.
O LORD, you are my God; I will exalt you, I will praise your name; for you have done wonderful things, plans formed of old, faithful and sure.
For you have made the city a heap, the fortified city a ruin; the palace of aliens is a city no more, it will never be rebuilt.
Therefore strong peoples will glorify you; cities of ruthless nations will fear you.
For you have been a refuge to the poor, a refuge to the needy in their distress, a shelter from the rainstorm and a shade from the heat. When the blast of the ruthless was like a winter rainstorm, the noise of aliens like heat in a dry place, you subdued the heat with the shade of clouds; the song of the ruthless was stilled.
Isaiah 25:1-5 (NRSV, emphasis added)
The text does not leave in doubt the reality of the subjugation of ‘strong peoples’ and ‘ruthless nations’.
Indeed, they find themselves on ‘the mountain of the Lord’ (verse 6, just following) precisely because their city and palace have been leveled. Verse 5’s verbs conclude the first section of this oracle with divine activities that leave no doubt about the matter. YHWH subdued the short-lived heat of the peoples (תכניע) and stilled the song of the ruthless (יענה, rendered by NRSV somewhat lyrically by the passive ‘was stilled’ for the Masoretic Text’s 3ms active deployment of a verb often rendered more prosaically as to humiliate).
Clearly, these peoples are considered to be nations that YHWH has subjugated as the outworking of his ancient purpose (25.1).
Yet is not at all apparent that this outcome is one that the peoples themselves lament. Indeed, verse 3 could be read as the vocabulary of mere conquest, forced upon unwilling victims. But in context, particularly the context provided by the oracle from verse 6 forward, there seems to be yet again an element of willing participation in the deportment of the conquered.
Therefore strong peoples will glorify you; cities of ruthless nations will fear you.
Isaiah 25:3 NRSV)
Verses 6-10 will fill in the picture, if indeed those verses are to be read as a unity with verses 1-5, as appears to me to be the case. Its scattering of ‘all’ across the range of its protagonists insinuates a banquet where all—past historical enemies included—lift their cups together and tuck into the feast with the careless abandon of friends.