Context: Revelation 21 opens the book's final vision: after the last judgment and the second death (20:11-15), John sees "a new heaven and a new earth" (21:1) and then the central image of the consummation: "I saw the holy city, the new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband" (21:2). A throne-voice interprets the descent in covenant-formula language — "Behold, the dwelling place of God is with man, and He will dwell with them. They will be His people, and God Himself will be with them as their God" (21:3). The vision is then resumed and expanded: one of the bowl-angels says, "Come, I will show you the bride, the wife of the Lamb" (21:9), and shows John "the holy city of Jerusalem coming down out of heaven from God, shining with the glory of God" (21:10-11) — the explicit identification of bride and city. For this trajectory the decisive datum is which Jerusalem descends. Paul had set "the present Jerusalem," in slavery with her children, against "the Jerusalem above," who "is free, and she is our mother" (Galatians 4:25-26). Revelation 21 is the moment the Jerusalem above stops being above: the heavenly mother-city of the promise-children becomes cosmically public and physically final, while the present-Jerusalem/Babylon order has passed away with the first creation (21:1; cf. Revelation 17-18). And the city has a boundary: "But nothing unclean will ever enter it... but only those whose names are written in the Lamb's Book of Life" (Revelation 21:27) — the consummated form of the exclusion this trajectory has traced since Genesis 21:10.
Greek Key Terms:
OT-to-OT Development (applicable because Revelation 21:2-11 is a mosaic of OT texts): The barren-woman paradigm enacted in Sarah (Genesis 11:30 → 21:1) was prophetically redirected to Zion by Isaiah: "Sing, O barren one... the children of the desolate one will be more than the children of her who is married" (Isaiah 54:1), with Zion's Maker as her husband (Isaiah 54:5). Isaiah likewise supplies the "holy city" summons (Isaiah 52:1) and the bride-adornment image (Isaiah 61:10), while Ezekiel's visionary city seen "on a very high mountain" (Ezekiel 40:2; cf. Revelation 21:10) provides the architectural template. Revelation 21 gathers these threads — barren-mother-vindicated, holy city, adorned bride, mountain-city — into a single descending reality: the eschatological mother whose children Isaiah promised would "spread abroad to the right and to the left" (Isaiah 54:2-3) now appears as the city that contains them.
Connections:
Intertextual Connection: Revelation 21:2 ← Isaiah 52:1b; Revelation 21:2 ← Isaiah 61:10; Revelation 21:9-10 ← Ezekiel 40:1-2; Galatians 4:27 ← Isaiah 54:1
Christological Connection: In its own context, Revelation 21:2-11 teaches that the consummation of redemption is a given city: holy, new, descending, prepared, adorned, radiant with God's own glory (21:11). Every participle of the bride's readiness is passive — she has been prepared, she has been adorned — because the city's perfection is God's accomplishment, not her construction project. The throne-voice glosses the descent with the covenant formula (21:3): the city is the place where "they will be His people, and God Himself will be with them as their God" — covenant inheritance in its final, unmediated form.
For this trajectory, the descent settles the case of the two Jerusalems. Paul's argument in Galatians 4:21-31 left history with two mothers in the field: the present Jerusalem bearing slave-children through flesh and law-works, and the Jerusalem above bearing free children through promise and Spirit. Revelation resolves the contest. The flesh-mother's order — present Jerusalem, Babylon the prostitute, the whole economy of what human capacity can produce — has passed away with the first heaven and first earth (21:1; Revelation 18); only the free mother remains, and she descends as the bride of the Lamb. The children of the barren one, whom Isaiah promised would outnumber the children of her who had a husband (Isaiah 54:1; Galatians 4:27), are gathered into the very mother-city that bore them. And the inheritance logic of Genesis 21:10 reaches its eschatological horizon — by theological inference rather than citation: Revelation 21 does not quote "cast out the slave woman and her son"; its own exclusion warrant is 21:27, "nothing unclean will ever enter it... but only those whose names are written in the Lamb's Book of Life." Yet the shape is the same shape: the flesh-born do not inherit alongside the promise-born. What Sarah demanded in a tent and Paul applied to a congregation, the throne enforces over the new creation — with the criterion now fully unveiled as union with the Lamb. The slain Lamb is the city's husband (21:9), its temple (21:22), its lamp (21:23), and the keeper of its register (21:27); entrance turns on nothing in the flesh — descent, circumcision, law-keeping — and everything on whether one's name stands in His book.
Already/not-yet: the already is real and load-bearing — believers are children of the free mother now (Galatians 4:26, present tense) and "have come" to the heavenly Jerusalem now (Hebrews 12:22, perfect tense); on that basis Paul could demand the Judaizers' expulsion now (Galatians 4:30). The not yet is this vision: the mother-city presently possessed by faith descends into sight, the bride is publicly wed, the covenant formula is spoken over a glorified people, and the boundary between flesh and promise — contested in every generation of church history — is rendered permanent and visible. The trajectory that began with a slave woman's son mocking a toddler at a weaning feast ends with the wedding of the Lamb and a city whose gates never shut (21:25) yet which nothing unclean ever enters (21:27).
Connection Method(s): Promise-Fulfillment (primary) — the vision verbally consummates Isaiah's holy-city (52:1), bride-adornment (61:10), and barren-mother (54:1) promises, the last of which Paul had already attached to this trajectory at Galatians 4:27; the covenant formula of 21:3 delivers what Genesis 17:19's "everlasting covenant" pledged. Also Contrast — the trajectory's engine runs to its terminus: two women, two covenants, two Jerusalems resolve into one remaining city, with 21:27's exclusion boundary consummating the flesh-born/promise-born distinction (the Genesis 21:10 pattern completed by theological inference, not citation). Also Redemptive-Historical Progression — Revelation 21 is the terminal node of the arc from Hagar's tent through Sinai, Zion, exile, Christ, and the church age. Also Longitudinal Theme — Marriage and Bride, Seed and Offspring, and Land and Inheritance converge here. ANTI-DEFAULT CHECK: Typology is not claimed — consistent with this trajectory's classification (Analogy and Contrast, not typology), the Jerusalem-above is not an escalated antitype of Sarah but the reality to which Paul's allegorical analogy pointed; the correspondence remains associative (free mother → free city-mother), and Revelation's own warrant for the exclusion is the Book of Life, not a typological reuse of Genesis 21:10.
See Also: Sarah (Mother of Promise) — Revelation 21:2 — the same descent from the mother-bride side, with full lexical analysis of the bridal vocabulary and the Babylon/New-Jerusalem two-women contrast; Two Covenants (Law and Promise) — Revelation 21:3-4 — the covenant-formula consummation (21:3-4) from the covenantal side.
Trajectory Table: 068 - Hagar and Ishmael (Children of the Flesh)