Isaiah 27:1 → Genesis 3:15

Isaiah 27:1 is the Old Testament's clearest eschatologizing of the Eden serpent. "In that day the LORD will take His sharp, great, and mighty sword, and bring judgment on Leviathan the fleeing serpent (נָחָשׁ, nachash)—Leviathan the coiling serpent (נָחָשׁ)—and He will slay the dragon of the sea." The word נָחָשׁ ("serpent") is the very term Genesis 3 uses for the deceiver (Gen 3:1, 14), and Isaiah promises that on the Day of the LORD God himself will finally slay this serpent. The protology of Eden — a serpent under sentence of head-crushing — is here projected onto the cosmic horizon: the enmity God installed in Genesis 3:15 reaches its decreed terminus in the slaying of the serpent-dragon. Isaiah identifies the Eden serpent with Leviathan, the chaos-monster, escalating the conflict from a garden curse to a Day-of-the-LORD victory. Revelation 12:9 completes the identification — "that ancient serpent called the devil and Satan" — and Revelation 20:10 narrates his final consignment. The telos is the certainty and glory of the serpent's end: the believer's assurance is that the deceiver is not merely wounded but appointed for slaying by the LORD's own sword, so that the longing for evil's destruction is answered in a victory that is God's to win and ours to enjoy.