This is the hinge of the letter’s central argument. Everything from 4:1 has been describing minority: an heir who owns everything but differs in no practical respect from a slave, kept ὑπὸ ἐπιτρόπους καὶ οἰκονόμους until the father’s appointed day. Verse 4 is that appointed day arriving.

Four things are asserted in one compact sentence, and the compression is the point:

1. The timing is the Father’s. The date was set (προθεσμία, v. 2) and the date came. Paul does not say God waited for conditions to ripen; he says the measure filled up.
2. The Son is sent out. ἐξαπέστειλεν presupposes the Son as already the Son prior to the sending — the same verb is then used of the Spirit in v. 6, binding the two missions into one divine act.
3. Born of a woman. Real human origin, stated with the ordinary Jewish idiom for being human at all.
4. Born under law. Real Jewish origin, under the very regime from which v. 5 says he redeems.

The two participles are not decoration. They state the two qualifications the redeemer must have in order to buy out those who are themselves ὑπὸ νόμον and to secure υἱοθεσία for them. He goes where they are, under the same jurisdiction, in order to bring them out.

The verse has carried enormous doctrinal weight — incarnation, pre-existence, the humanity of Christ, Mariology — and some of that weight is more than the four words can bear. The apparatus below tries to say what the Greek says and to mark clearly where readers have gone further.

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The main clause is short: ἐξαπέστειλεν ὁ θεὸς τὸν υἱὸν αὐτοῦ. Everything else hangs on it.

• ὅτε δέ … — temporal clause fronted, answering ὅτε ἦμεν νήπιοι in v. 3. The δέ is adversative: the age of minority, then the turn.
• γενόμενον … γενόμενον … — two aorist participles in the accusative, agreeing with τὸν υἱόν, in asyndeton (no καί between them). Per the standing asyndeton policy, no connective is supplied in English; the abruptness is the rhetoric.
• ἵνα … ἵνα … (v. 5) — two purpose clauses, likewise unlinked, the second dependent on or parallel to the first.

The result is a four-beat structure of paired unlinked members, which is why many read vv. 4-5 as pre-Pauline creedal or hymnic material that Paul has taken up. The parallelism is real; whether it is quotation is not demonstrable.

Aspect of the participles. The aorists are best read as coincident with or antecedent to the sending in narrative logic, but they are not temporally sequenced against ἐξαπέστειλεν. Paul is describing the Son as sent-and-so-qualified, not narrating a sequence of events. Rendering “who was born” (relative clause) is acceptable in smooth English; the literal tier keeps the participial form so the reader sees they are attributive modifiers of τὸν υἱόν, not a new clause.

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πλήρωμα is the noun of πληρόω — already fixed in this corpus as “fill up / make full,” with the vessel image kept live. The noun names either the act of filling, the thing that fills, or the resulting full measure. Here the third: the allotted span has been filled to its brim.

The choice of χρόνος rather than καιρός matters. καιρός is the opportune moment; χρόνος is duration measured. Paul has just used προθεσμία (v. 2), a legal term for the day fixed in advance by a testator or guardian’s arrangement. τὸ πλήρωμα τοῦ χρόνου is that προθεσμία expressed in temporal rather than juridical vocabulary: the clock ran out because the father set it, not because history matured.

Note the near-parallel at Eph 1:10, εἰς οἰκονομίαν τοῦ πληρώματος τῶν καιρῶν — plural καιροί there, singular χρόνος here. Genuinely different phrases; do not harmonize.

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A double-compound: ἐκ + ἀπό + στέλλω, “send out and away.” Frequent in the LXX (Gen 3:23 of Adam driven from the garden; Exod 3:10 of Moses commissioned; Ps 56:4 LXX of God sending help from heaven) and in Luke-Acts. Paul uses it only twice, both in this passage — v. 4 of the Son, v. 6 of the Spirit. The repetition is structural: one Sender, two missions, one outcome (sonship, then the cry of sonship).

How much the verb carries is contested.

Rendering: keep sent out / sent forth rather than a bare “sent,” so the double prefix is visible and the v. 4 / v. 6 pairing is traceable in English.

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Definite and possessive: his Son, not “a son.” The phrase launches a chain that runs to the end of the paragraph:

• v. 4 τὸν υἱὸν αὐτοῦ
• v. 5 τὴν υἱοθεσίαν (adoption as sons)
• v. 6 ἐστε υἱοί / τὸ πνεῦμα τοῦ υἱοῦ αὐτοῦ
• v. 7 οὐκέτι εἶ δοῦλος ἀλλὰ υἱός

English must keep one root across all of these or the argument becomes invisible. This is a case where §3 of the rules bites: υἱός is masculine and the referents in vv. 6-7 are demonstrably a mixed congregation. The Greek is not making a statement about the sex of believers; it is assigning to them the legal standing of the son and heir, which in Greco-Roman and Jewish law was the status that carried inheritance. Rendering “children” in vv. 6-7 would be more comfortable and would break the link to τὸν υἱὸν αὐτοῦ in v. 4 — the whole point being that they receive the standing his Son already has. Keep “sons,” and note the mixed referent rather than neutralizing it.

Parallel: Rom 8:3, ὁ θεὸς τὸν ἑαυτοῦ υἱὸν πέμψας ἐν ὁμοιώματι σαρκὸς ἁμαρτίας — same sending-formula, same purpose structure, but with the reserve of ὁμοίωμα. Galatians has no such reserve: γενόμενον ἐκ γυναικός is unqualified.

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Paul writes γενόμενον (from γίνομαι, “come to be”), not γεννηθέντα (from γεννάω, “be begotten/born”). The distinction is one letter in the manuscript and a substantial one in sense.

• γεννάω is the ordinary verb of birth and begetting. Paul uses it three times in this very chapter of Abraham’s sons (4:23, 24, 29).
• γίνομαι is the verb of entry into a state or condition. The corpus glossary already fixes it in Christological contexts as “come to be / become,” precisely to preserve the contrast with ὑπάρχω (“exist”) at Phil 2:6.

That contrast is operative here too. The one who is sent as the Son comes to be out of a woman and comes to be under law. He enters conditions that were not previously his. Rendering both participles “born” (which English idiom nearly forces in the first member) obscures this — and in the second member, γενόμενον ὑπὸ νόμον, “born under law” is idiomatically fine but conceptually loose: one is not born under a jurisdiction in the same sense one is born of a mother. The single Greek word covers both because γίνομαι means entry into a condition, full stop.

Policy adopted here: smooth registers use “born … born” to keep the audible repetition Paul built (see below); the literal tier uses “having come to be … having come to be” so the reader can see the verb is not γεννάω.

The repetition is deliberate. Greek could have written one participle governing both prepositional phrases. Repeating it, in asyndeton, gives two equally weighted qualifications. Per the standing verb-repetition policy (Phil 4:2, 4:17), English repeats the participle even at cost to smoothness.

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Anarthrous and unnamed. Not “the woman,” not Mary, not “a virgin.” Paul writes the plainest possible phrase.

The idiom is Jewish and stock. Job 14:1 LXX: βροτὸς γὰρ γεννητὸς γυναικός — “a mortal, born of woman.” Sir 10:18; Matt 11:11 (ἐν γεννητοῖς γυναικῶν). In every case the phrase means simply human being, with an overtone of frailty and mortality. ἐκ + genitive of the mother is the ordinary Greek of descent (cf. Gal 4:22-23 in this same chapter: ἕνα ἐκ τῆς παιδίσκης … ἕνα ἐκ τῆς ἐλευθέρας).

So the first thing the phrase asserts is real, ordinary, mortal humanity — and it asserts it of the one just called his Son. Set against Rom 8:3’s guarded ἐν ὁμοιώματι σαρκὸς ἁμαρτίας, Galatians is unqualified. Whatever else Paul thinks about the Son, he thinks he was humanly born.

On Mariological weight. The Latin factum ex muliere stands behind a long devotional tradition. That resonance may be named (§11) but is not evidence for the rendering. Paul does not name her, and the translation does not either.

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ὑπό + accusative = under the authority or jurisdiction of. The preposition is the connective tissue of the whole paragraph:

• v. 2 ὑπὸ ἐπιτρόπους καὶ οἰκονόμους — under guardians and stewards
• v. 3 ὑπὸ τὰ στοιχεῖα τοῦ κόσμου — under the elements of the world
• v. 4 ὑπὸ νόμον — under law
• v. 5 τοὺς ὑπὸ νόμον — those under law
• cf. 3:23 ὑπὸ νόμον ἐφρουρούμεθα — we were kept under guard, under law

One English preposition must serve all of them or the reader cannot see that Paul is describing one condition under several names.

νόμον is anarthrous. Per the standing policy on anarthrous νόμος: the absence of the article does not make the referent generic — Torah is plainly in view, since v. 5 makes the redeemed those under it and the whole Hagar/Sarah allegory follows. But the anarthrous form presents law as a regime or measuring standard rather than as a named document. Render “under law,” not “under the law”; do not capitalize.

What it asserts about the Son. He is born a Jew, subject to Torah’s obligations and to its verdict. This is the qualification the redemption of v. 5 requires: the redeemer is inside the jurisdiction he buys people out of (ἐξαγοράσῃ, a market verb — purchase out of).

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The verse is textually stable. NA28 prints it without a variant unit in the main apparatus, and Metzger’s committee volume treats no reading here as requiring discussion. The witnesses are broad and early: 𝔓⁴⁶, ℵ, A, B, C, D, F, G, and the versions all support the printed text.

Two minor points worth recording, neither affecting the sense:

1. γενόμενον / γεννώμενον. A handful of late minuscules and some patristic citations read a γεννα- form in place of the second γενόμενον, assimilating the participle to the ordinary verb of birth. It is a secondary smoothing in exactly the direction English translations are tempted to go, and it has no early support. The reading is worth naming because it shows the pressure the γίνομαι/γεννάω distinction was under from early on.
2. Word order of ὁ θεός. Some witnesses transpose the subject. Trivial, and without exegetical consequence.

The stability is itself data. Whatever difficulty this verse creates for later theology, it was not created by scribes.

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Vulgate: At ubi venit plenitudo temporis, misit Deus Filium suum, factum ex muliere, factum sub lege. Note factum twice — Jerome tracks γίνομαι rather than γεννάω, and preserves the repetition. Later Latin witnesses and much subsequent citation read natum, which loses both.

Old Latin witnesses vary between factum and natum, so the variation is early on the Latin side even though the Greek is firm.

Syriac Peshitta renders the sending with a verb of dispatch and the participles with a form built on the root for birth (ܝܠܕ), so the Syriac tradition also reads “born” at both points. Both versional traditions, in their later forms, converge on “born” — which is why the distinction in the Greek needs to be flagged explicitly rather than left to the reader to notice.

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The Fathers read this verse almost entirely as a defense of the reality of the incarnation against docetic and adoptionist alternatives, and their concerns are lexically instructive.

Irenaeus (Adv. Haer. 3.22.1) argues from ex muliere that the Son took substance from Mary and did not merely pass through her — against those who held that Christ took nothing from the human side. The phrase is for him a proof of real material humanity.

Tertullian (De carne Christi 20) presses ex against per: not made through a woman as through a channel, but out of her substance. Whatever one makes of his further inference toward the manner of the birth, his reading of the preposition is sound Greek — ἐκ + genitive of the mother is the language of derivation, not of transit.

Chrysostom (Hom. in Gal. 4) fastens on the sequence: God sent his Son, therefore the Son was before he was sent; and yet he came to be of a woman, therefore he truly became what he was not. Chrysostom also supplies the “fullness of time” argument from world-readiness — historically influential, exegetically an addition (see above).

Marius Victorinus and Augustine in the Latin West work with factum, and Augustine is careful that factum here does not mean creatum — the Son is made of a woman, not made out of nothing.

The common thread: the early readers took the two participles with full seriousness as statements of real entry into human and Jewish conditions, and they used the precise prepositions to make their case. That is the right instinct, and it argues for keeping the prepositions and the participial form visible in translation rather than smoothing them.

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The verse is doing soteriological work before it does Christological work, and the order matters.

Paraphrasing the logic of vv. 3-5: we were minors, enslaved under the στοιχεῖα; the Son is sent, entering the same conditions — human, and under law; in order that those under law be bought out and receive the standing of sons. The structure is exchange by identification. He goes under; they come out.

Three things the verse does assert:

• The initiative is the Father’s, and it is timed by him. Grace here is not responsive but scheduled.
• The Son’s humanity is unqualified. Galatians has none of the reserve of Rom 8:3’s ὁμοίωμα. He came to be out of a woman.
• The Son’s Jewishness is soteriologically load-bearing. ὑπὸ νόμον is not incidental biography. It is the qualification without which ἐξαγοράσῃ in v. 5 has no purchase.

One thing the verse implies but does not state in so many words: pre-existence. τὸν υἱὸν αὐτοῦ + ἐξαπέστειλεν + γενόμενον is a sequence in which the Son is Son first and human after. That is a strong inference and the standard one. It is an inference from the sentence’s shape, not from any single word, and it should be presented that way (see the ἐξαποστέλλω section).

One thing the verse does not address at all: the manner of the conception. The apparatus above sets out the contest; the translation leaves it where Paul left it.

Finally, for §1 purposes: ὁ θεός here is the Father, distinguished from τὸν υἱὸν αὐτοῦ and, in v. 6, from τὸ πνεῦμα τοῦ υἱοῦ αὐτοῦ. Rendered “God” per standing policy; the Trinitarian shape of vv. 4-6 is Paul’s own, in the plainest possible language, and needs no help from the translator.

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