Acts 3:25 → Genesis 22:18

Peter's quotation in Acts 3:25 — "Through your offspring all the families of the earth will be blessed" (en tō spermati sou eneulogēthēsontai pasai hai patriai tēs gēs) — matches the LXX of Gen 22:18 more closely than Gen 12:3, with the specific phrase en tō spermati sou ("in your seed/offspring"), which Gen 12:3 lacks. (Paul's lemma at Gal 3:16 is a different formula — the land-grant "and to your seed" — so this verse is Peter's, not Paul's, seed-citation.) Gen 22:18 is the climactic form of the Abrahamic promise, sworn by God himself immediately after the near-sacrifice of Isaac. Peter quotes it as a promise now kept: the universal blessing through the "seed" is fulfilled in the risen Servant, and this fulfillment is now being preached to the same people who handed over the Son (Acts 3:13), yet to whom the blessing is offered first (3:26). (The Akedah's own typology — Isaac delivered up and received back, cf. Heb 11:19 — is traced in TT 077 Isaac and TT 003 Abraham and is cited here, not argued.)