Excerpt - Apocalyptic Commentary of the Book of Isaiah by Avraham Gileadi, Ph.D.

25:9 In that day you will say, This is our God, whom we expected would save us. This is Jehovah for whom we have waited; let us joyfully celebrate his salvation!

A Song of Salvation marks Jehovah’s deliverance of his people who acknowledge him as “our God”—their covenant Lord. The motif of “expecting” or “waiting” (qiwweh) for Jehovah’s coming to deliver them defines the time of trial of his people’s faith that precedes his millennial reign (Isaiah 8:17; 26:2–4; 30:18; 33:2, 6; 35:3–4; 49:23; 64:4). Jehovah’s coming as salvation constitutes salvation itself: “Jehovah has made proclamation to the end of the earth: ‘Tell the Daughter of Zion, “See, your Salvation comes, his reward with him, his work preceding him”’” (Isaiah 62:11; emphasis added).

25:10–12 For in this mountain rests the hand of Jehovah, and under him Moab shall be trampled down as straw is trampled in a dung pit. For when he stretches his hands into the midst of it, as a swimmer spreads his hands to swim, he will pull down his pride in the attempt. Your highly walled fortifications he will lay low by razing them to the ground, even with the dust.

Two “hands” of Jehovah qualify to fulfill this prediction: (1) Jehovah’s right hand—his servant—who “rests” (tanuah) in this mountain or nation upon receiving his inheritance of rest (Isaiah 11:10); and (2) Jehovah’s left hand—the king of Assyria/Babylon—who “alights” (tanuah) in this mountain or nation to trample Moab (cf. Isaiah 10:5–6). As a prideful kindred people (Isaiah 15–16), Moab is trodden as “straw” and its institutions are razed to the “dust.” Moab thus meets the same fate as the wicked “city”—Greater Babylon—that is razed to the dust and trodden underfoot (Isaiah 26:5–6; 47:1).

See more here and here
Buy the book