Later text
Isaiah 25:10BSB
For the hand of the LORD will rest on this mountain. But Moab will be trampled in his place as straw is trodden into the dung pile.
Intertextuality Pair
Echo
Later text
Isaiah 25:10BSB
For the hand of the LORD will rest on this mountain. But Moab will be trampled in his place as straw is trodden into the dung pile.
Earlier text
So the LORD God said to the serpent: "Because you have done this, cursed are you above all livestock and every beast of the field! On your belly will you go, and dust you will eat, all the days of your life. And I will put enmity between you and the woman, and between your seed and her seed. He will crush your head, and you will strike his heel."
This is a weak pairing, and the evidence should be stated plainly. Isaiah 25:10 is built on דושׁ (dush, "to thresh," used twice: "Moab will be trampled in his place as straw is trodden into the dung pile" (דושׁ ×2, literally "threshed … as straw is threshed")), מַתְבֵּן (mathben, "straw"), and מַדְמֵנָה (madmenah, "dung-pit"). Genesis 3:14 is built on נָחָשׁ (nachash, "serpent"), גָּחוֹן (gachon, "belly"), and עָפָר (aphar, "dust"); Genesis 3:15 on אֵיבָה (eybah, "enmity"), זֶרַע (zera, "seed"), שׁוף (shuph, "crush/strike"), and רֹאשׁ (rosh, "head"). Not one lexeme is shared. Isaiah's image is threshing into a dung-pit, not treading into dust, and none of the Genesis 3:15 markers — seed, head, heel, enmity, serpent — appears anywhere in the Isaiah oracle.
What is real is broader and looser: Isaiah 25:10 belongs to the biblical pattern of the LORD's enemies put underfoot, of which Genesis 3:15 is the fountainhead. The verse sits in a chapter whose subject is the LORD's hand resting on Zion's mountain while the proud are brought low (25:6-12), and that is a genuine station in a canon-long theme. But the participation is thematic; Isaiah is not referring to Eden here, and the Reference Type is set at Echo to say so.
For the Isaianic text that does eschatologize the Eden serpent, see Isaiah 27:1 to Genesis 3:15. There Isaiah uses נָחָשׁ — the Genesis 3 word — twice of Leviathan, and announces that on that day the LORD will slay him. That is where the protoevangelium's trajectory surfaces in Isaiah with textual warrant; Isaiah 25:10 supplies the atmosphere of the same expectation without the vocabulary.
The theme itself terminates in Christ, and the New Testament states it in the Genesis idiom rather than the Isaianic one: "the God of peace will soon crush Satan under your feet" (Romans 16:20). The delight in that promise is not in Moab's humiliation but in the certainty that the hostility God installed in Eden has an appointed end, and that the ending is God's work and not ours to accomplish — which is why Isaiah 25 answers it with a feast (25:6) and with "let us rejoice and be glad in His salvation" (25:9).