Isaiah 1:9 → Genesis 19:24-28

Genesis 19:24-28 narrates the historical source-event: "the LORD rained down sulfur and fire on Sodom and Gomorrah—from the LORD out of the heavens," destroying "these cities and the entire plain," so that Abraham the next morning saw "the smoke rising from the land like smoke from a furnace" — the categorical paradigm of total divine annihilation, no survivors, no rebuild, no return. Isaiah 1:9 invokes that very event by name (כַּסְּדֹם / כַעֲמֹרָה, kis'dom / ka'amorah, "like Sodom / like Gomorrah") to measure the judgment Israel deserved at the climax of the opening covenant-lawsuit: "Unless the LORD of Hosts had left us a few survivors (שָׂרִיד, sarid), we would have become like Sodom, we would have resembled Gomorrah." The connection is Analogy, not typology: Isaiah does not present Sodom as a forward-pointing type escalating to an antitype, but as the fixed comparative benchmark for absolute judgment — the only fitting historical analogue for what Israel's corruption merited (v. 10 then names her rulers outright "rulers of Sodom"). It is also a Longitudinal Theme: Gen 19 seeds a recurring prophetic comparison-formula (Deut 29:23; Isa 13:19; Jer 49:18; 50:40; Amos 4:11; Zeph 2:9; Lam 4:6), and Isa 1:9 is its distinctive counterfactual-mercy instance — what Israel "would have become" except for sovereign preservation of a remnant. That counterfactual is where the gospel sweetness breaks in: the same warrior-LORD whose fire fell on Sodom chose to leave survivors, and the LXX reads that survivor as σπέρμα, "seed" — the residual germ Paul welds to the elect seed of Abraham and to Christ (Rom 9:7-8, 29; Gal 3:16). Beholding this, the believer sees that he is the Isa 1:9 seed, spared the deserved Sodom-fire not by his own soundness ("from the sole of your foot to the top of your head, there is no soundness") but by the sovereign mercy of the LORD of Hosts — and that mercy is not merely a fact escaped but a Person to be savored, the Christ in whom the preserved remnant becomes a people for God's own delight, out of every tribe and tongue.