one who is sent out with the authority of the one who sent him; a commissioned envoy
TranslatabilityPartialCertaintyStrong
At its plainest the word means simply a person sent on someone else's behalf, carrying that person's authority. The Greek word itself was rare and almost colorless before the church took it up, so its whole force comes from who does the sending and for what purpose. The deep idea underneath every use is the same: the one sent stands in the place of the one who sent him and speaks with his backing, within the bounds of his errand.
The early church poured a remarkable amount of meaning into this thin word. Most often it names the small circle Jesus chose and sent out, and then the wider group commissioned by the risen Christ to plant and lead churches. But the same word still does ordinary work too, naming a congregation's appointed representative, and at one striking point it names Jesus himself as the one God sent.
These are not separate words but one word seen at different ranges. What ties them together is the act of authorized sending. The senses below sort the uses by who is sent and on whose authority, from the everyday errand-runner up to the foundational figures of the church and to Christ the Sent One of God.
Nuances
1aan ordinary envoy or representative: a person a group sends to act and speak for it
Jhn 13:16*2Co 8:23Php 2:25
1bthe Twelve: the inner circle Jesus chose and sent, the church's eyewitness foundation
Whether Romans 16:7 counts Andronicus and Junia among the apostles ("outstanding among the apostles") or only says they were well known to the apostles.
majorityThe phrase includes them among the apostles: it is the more natural reading of the Greek, and Greek-speaking church fathers read it that way without dispute.; E. J. Epp, Junia: The First Woman Apostle (2005); L. Belleville, NTS 51 (2005): 231-49; Y.-J. Lin, JBL 139 (2020): 191-209
minorityThe phrase means they were well known to the apostles rather than apostles themselves, on the grounds that the construction is best read that way.; M. H. Burer and D. B. Wallace, NTS 47 (2001): 76-91
1dJesus himself as the one God sent into the world
the Greek stresses being sent and authorized by the sender, not merely carrying newsJhn 13:16
Both
both can name a person a group commissions to act and speak on its behalf2Co 8:23Php 2:25
Only messenger
"messenger" in English foregrounds the message delivered and can sound like a mere errand-runner, losing the note of standing in the sender's place
How apostolos differs from similar Greek words
ἄγγελοςa messenger defined by the message carried, often a heavenly one; an apostle is defined instead by being personally sent and commissioned by the sender
Names a human delegate sent out with the authority of the one who sent him, so the weight falls on the commission and the backing behind it, not merely on words delivered.Mat 10:2Luk 6:13
Functions as a near-title for the inner circle Jesus chose and sent, and then for others recognized as commissioned witnesses of the risen Christ, a defined office in the early church.Act 1:261Co 15:9Gal 1:1
Listed among the gifts and roles God appoints within the church, ranked first among them, which a mere messenger never is.1Co 12:28Eph 4:11
Can be used loosely of an authorized envoy a congregation sends on its behalf, a representative who acts in its name.2Co 8:23Php 2:25
Both
Both name a sent one entrusted with a mission from a higher authority, so the two stand side by side as figures God puts forward to do his bidding before the world.1Co 4:9
Names a being whose whole identity is delivering a message, so the focus falls on the announcement carried, not on who did the sending. Gabriel arrives simply to speak the words God gives him.Luk 1:19Mat 1:20
Overwhelmingly refers to a heavenly being, an angel, a created spirit who serves and worships God in his court and acts on his commands.Heb 1:6Mat 25:31Rev 5:11
Can name a purely human courier or herald with no special standing, someone who simply carries word from one party to another.Luk 7:24Luk 9:52
Used of evil and destructive spirits too, so it does not by itself imply a good or commissioned status, only the role of carrying out an errand.Mat 25:412Co 12:7
κῆρυξa herald who publicly announces; an apostle not only announces but is a sent, authorized agent of the one who commissioned him
Names a standing office: someone personally commissioned and sent by Christ to act with his delegated authority, like the Twelve and Paul. The weight is on the sending and the authority it confers, not on any single act.Mat 10:2Rom 1:11Co 1:1
Reaches beyond the office to anyone sent on another's behalf, a representative or envoy, so a church can have its own sent ones and a servant is no greater than the one who sent him.Jhn 13:162Co 8:23Php 2:25
Because it is a claim to commissioned standing, it can be falsely claimed, which is why the New Testament warns of those who only pose as sent ones.2Co 11:13Rev 2:2
Both
Paul stacks both titles for himself, so both can describe the same person's God-given charge to carry the gospel: he is at once the one sent and the one who proclaims.1Ti 2:72Ti 1:11
Names the public announcer himself, one who proclaims a message aloud, with no notion of being sent or holding office: Noah is called a herald of righteousness simply because he announced it, though he was never anyone's commissioned representative.2Pe 2:5
μάρτυςa witness who testifies to what he has seen; for Luke this overlaps with apostle, since an apostle of the Twelve had to be a witness of the resurrection, but the words view the role from different angles
Names someone SENT out with delegated authority and a commission; the core idea is the dispatching, not the report. Jesus appoints and sends the Twelve, and the title sticks to that authorized sending.Mrk 3:14Luk 6:13
Functions as a recognized office or standing role in the church, listed alongside prophets and teachers as one of the offices God appointed, something a witness never is.1Co 12:28Eph 4:11
Carries weight as a commissioned credential one can claim, defend, or counterfeit: Paul argues he is a true apostle sent by Christ, and warns of false apostles who only pose as one.Gal 1:12Co 11:13
Can be a plain delegate or envoy sent on an errand by a church or person, an everyday sense the legal-testimony word never carries.Php 2:252Co 8:23
Both
Both name authoritative figures in the early church's mission whose role centers on the risen Jesus: the apostles are themselves attesters of the resurrection, and the witness is defined by testifying to that same risen Lord, so the two roles overlap in the same people.Act 4:33Act 1:22
Names someone who TESTIFIES to what they have personally seen or known; the core idea is giving evidence, especially of the risen Jesus, not being sent. The disciples are commissioned as those who can vouch from firsthand sight.Act 1:8Act 2:32
Has a courtroom sense the apostle word lacks: the person who corroborates a charge so that, by two or three of them, a matter is established.Mat 18:162Co 13:1
Lets a speaker call God to vouch for the truth of his own heart, a use bound to the idea of attesting that the sending word never has.Rom 1:9Php 1:8
Stretches to one who keeps testifying to Jesus even to the point of being killed for it, the seed of the later word martyr.Act 22:20Rev 2:13
Names a definite, closed circle of men Jesus personally picked out and called by name, so the group has a roster and a vacancy in it has to be filled.Mat 10:2Luk 6:13Act 1:26
Carries authority handed down from the one who sent them, so their rulings settle disputes and are passed on to the churches as binding decisions.Act 15:2Act 15:6Act 16:4
Rests on the commission itself rather than on any activity, which is why the standing can be challenged and has to be defended by pointing back to who sent him.1Co 9:11Co 9:2
Ranks first when the roles God has placed in the church are listed in order, above every other office named alongside it.1Co 12:281Co 12:29
Keeps a plain everyday use as well: anyone sent on another person's business, in a saying that turns on the sent one ranking below the sender.Jhn 13:16
Both
Both name people Christ himself gave to his people, listed side by side among the roles that equip the church and build it up.Eph 4:11
Both do their work by carrying the good news out to people who have not yet heard it, rather than by tending a congregation already gathered.Rom 1:1Act 21:8
Identifies a man by the announcement he makes, attached to his name as a standing description of his work with no sending or commission mentioned.Act 21:8
Describes work another believer can simply be told to take up, so it is a task to be done rather than a standing conferred on a fixed group.2Ti 4:5
Puts the weight on being sent: the Twelve are called by this name when Jesus dispatches them, and they come back to report to him what they had done and taught.Mrk 6:30Luk 9:10
Names a recognized position in the church, listed alongside prophets and teachers and spoken of as part of the foundation the church is built on.1Co 12:28Eph 2:20Eph 4:11
Works as a title of standing that a writer claims for himself at the head of a letter, so that what follows carries authority.Rom 1:1Gal 1:11Pe 1:1
Because it is a claim to authority, it can be claimed falsely, and the New Testament tells churches to put the claim to the test.2Co 11:13Rev 2:2
Stretches to any authorized representative, so it also covers a man a congregation sends out on its behalf, where English Bibles usually render it "messenger" rather than "apostle".2Co 8:23Php 2:25
Is applied to Jesus himself, who is called the one sent from God, a use the other word never has.Heb 3:1
Both
The two overlap at the moment of choosing: Jesus calls his followers together and picks twelve out of them to bear the other name, so the sent men are drawn from the learners.Luk 6:13
Both name the same twelve men in the same scene, one verse calling them his twelve followers and the next listing the names of the twelve sent ones.Mat 10:1Mat 10:2
Neither word is locked to the Twelve: the wider crowd of followers is counted under one, while Barnabas, James, and Andronicus and Junia are counted under the other.Luk 6:17Act 14:14Rom 16:7
Both belong to the vocabulary of the earliest church in Acts, where the same community is described in both terms as it prays, grows, and settles its disputes.Act 6:2Act 15:2
Describes attachment to a teacher rather than a commission, so other teachers have them too: John the Baptist has his own, the Pharisees have theirs, and Jesus' opponents call themselves followers of Moses.Mat 9:14Mrk 2:18Jhn 9:28
Marks the learner's place under a master, the lower position in a pair where the teacher sets the standard the follower grows toward.Mat 10:24Luk 6:40
Comes with stated conditions that a person can fail: Jesus repeatedly says someone who will not count the cost cannot be one, and that staying in his teaching is what makes the claim real.Luk 14:27Luk 14:33Jhn 8:31
Becomes the ordinary everyday word for an ordinary believer in the early church, the group that grows in number and that gets called "Christians" for the first time in Antioch.Act 6:1Act 6:7Act 11:26
Covers people who follow quietly and even secretly, and people who walk away again, so it names an attachment that can be hidden or broken.Jhn 6:66Jhn 19:38
apostolos in the other biblical languages
מַלְאָךְHebrew“messenger: angel”the Hebrew word for a sent messenger, human or heavenly; the closest Old Testament counterpart to the plain envoy sense of apostle, the one sent who carries the sender's word
The angel of the LORD, a heavenly messenger who speaks and acts for God.Gen 16:7Exo 3:2
An ordinary human envoy sent between people or kings to carry word and negotiate.Num 20:14Num 22:5
שָׁלַחHebrew“to send: depart”the common Hebrew verb "to send," the action that stands behind the noun apostle; the Greek translators chose the matching verb to convey authorized sending, but used the noun apostle for it only once
What scholars say about apostolos
The lexical sense of the Greek noun is thin: "one sent, envoy, authorized messenger." The word is strikingly rare in this personal sense before the New Testament, attested securely only twice in Herodotus (1.21; 5.38) and otherwise tied to naval and bureaucratic life; the noun appears just once in the Septuagint (3 Kingdoms 14:6) for the Hebrew passive participle "sent," while the related verb "to send" occurs roughly 700 times. Rengstorf's influential proposal (TDNT) derived the New Testament concept from the rabbinic agent (the shaliach), whose authorized agent "is as himself," but this has been heavily eroded: the formal rabbinic institution is documented only after 70 CE and is a legal and commercial figure with no missionary dimension. Schmithals' alternative Gnostic-redeemer thesis is now generally rejected for lack of evidence. Francis Agnew's reviews of research (CBQ 38; JBL 105) and the lexica conclude that the early church took a rare, nearly empty Greek word and filled it with new content, drawing more on the Old Testament prophetic sending tradition and on the general ancient principle that an authorized envoy embodies the sender. BDAG and Louw-Nida now formally split the entry into an ordinary-envoy sense and a special-commission sense, separating word from office. New Testament authors use the term at noticeably different ranges: Luke-Acts restricts it mostly to the Twelve, Paul uses it more broadly of those commissioned by the risen Christ (himself, Barnabas, James, Andronicus and Junia, congregational delegates), Hebrews applies it once to Jesus, and the Didache shows the broad charismatic-missionary sense surviving into the second century.
Where scholars disagree about apostolos
Where the New Testament idea of an apostle comes from, given how thin and rare the Greek word was before the church used it.
majorityThe church took a nearly empty Greek word and filled it with new content drawn chiefly from the Old Testament tradition of God sending prophets, together with the general ancient principle that an authorized envoy stands in the sender's place; no single institution is its source.; F. H. Agnew, JBL 105 (1986): 75-96; M. Silva, ed., NIDNTTE, 1:371-78
minorityThe concept derives from the rabbinic authorized agent (the shaliach), whose agent "is as himself."; K. H. Rengstorf, TDNT 1:398-447
minorityThe title was borrowed from a pre-Christian Gnostic redeemer figure.; W. Schmithals, The Office of Apostle in the Early Church (1969)
Whether the equation "the apostles = the Twelve" reflects history or is mainly a literary construction by Luke.
majorityA twelve-man inner circle goes back to Jesus, even if Luke shaped the strict identification of that group with "the apostles"; Paul already distinguishes "the Twelve" from "all the apostles."; J. P. Meier, A Marginal Jew, vol. 3 (2001); C. K. Barrett, Acts, ICC (1994-1998)
minorityThe identification of "the apostles" with "the Twelve" is a Lukan theological construct rather than a historical reality.; G. Klein, Die zwölf Apostel, FRLANT 77 (1961)
In-depth research
This is a research paper, so it may be hard to read without scholarly background. It is useful if you want to dig even deeper into this word.
Sources
K. H. Rengstorf, 'ἀπόστολος,' TDNT 1:398-447lexicon
BDAG, 3rd ed., s.v. ἀπόστολοςlexicon
J. P. Louw and E. A. Nida, Greek-English Lexicon of the New Testament Based on Semantic Domains, 33.194; 53.74lexicon
C. Spicq, Theological Lexicon of the New Testament, 1:186-94lexicon
M. Silva, ed., NIDNTTE, 1:371-78lexicon
J. Roloff, 'ἀπόστολος,' EDNT 1:142-46lexicon
F. H. Agnew, 'On the Origin of the Term Apostolos,' CBQ 38 (1976): 49-53article
F. H. Agnew, 'The Origin of the NT Apostle-Concept: A Review of Research,' JBL 105 (1986): 75-96article
W. Schmithals, The Office of Apostle in the Early Church (1969)monograph
G. Klein, Die zwölf Apostel, FRLANT 77 (1961)monograph
J. Roloff, Apostolat - Verkündigung - Kirche (1965)monograph
J.-A. Bühner, Der Gesandte und sein Weg im 4. Evangelium, WUNT 2/2 (1977)monograph
M. M. Mitchell, 'New Testament Envoys in the Context of Greco-Roman Diplomatic and Epistolary Conventions,' JBL 111 (1992): 641-62article
J. D. G. Dunn, The Theology of Paul the Apostle (1998)monograph
E. J. Schnabel, Early Christian Mission (2004)monograph
E. J. Epp, Junia: The First Woman Apostle (2005)monograph
M. H. Burer and D. B. Wallace, 'Was Junia Really an Apostle? A Re-examination of Rom 16.7,' NTS 47 (2001): 76-91article
L. Belleville, 'Ἰουνιαν . . . ἐπίσημοι ἐν τοῖς ἀποστόλοις: A Re-examination of Romans 16.7,' NTS 51 (2005): 231-49article
Y.-J. Lin, 'Junia: An Apostle Before Paul,' JBL 139 (2020): 191-209article
H. W. Attridge, Hebrews, Hermeneia (1989), 104-8commentary
C. K. Barrett, The Acts of the Apostles, ICC (1994-1998)commentary