139. hairesis
Lexical Summary
hairesis: Sect, faction, heresy

Original Word: αἵρεσις
Part of Speech: Noun, Feminine
Transliteration: hairesis
Pronunciation: hah'-ee-res-is
Phonetic Spelling: (hah'-ee-res-is)
KJV: heresy (which is the Greek word itself), sect
NASB: sect, factions, heresies
Word Origin: [from G138 (αἱρέομαι - choose)]

1. (properly) a choice
2. (by extension) a preference
3. (specially) a (religious) party, a sect, a denomination
4. (abstractly) disunion

Strong's Exhaustive Concordance
heresy, sect.

From haireomai; properly, a choice, i.e. (specially) a party or (abstractly) disunion -- heresy (which is the Greek word itself), sect.

see GREEK haireomai

HELPS Word-studies

139 haíresis (a feminine noun derived from 138 /hairéomai, "personally select, choose") – properly, a personal (decisive) choice.

139 /haíresis ("a strong, distinctive opinion") is used in the NT of individual "parties (sects)" that operated within Judaism. The term stresses the personal aspect of choice – and hence how being a Sadducee (Ac 5:17) was sharply distinguished from being a Pharisee (Ac 15:5; 26:5).

[As a feminine noun, 139 (haíresis) highlights the subjective (individual) nature of a specific (divisive) opinion.]

NAS Exhaustive Concordance
Word Origin
from haireó
Definition
choice, opinion
NASB Translation
factions (2), heresies (1), sect (6).

Thayer's Greek Lexicon
STRONGS NT 139: αἵρεσις

αἵρεσις, (εως, ;

1. (from αἱρέω), act of taking, capture: τῆς πόλεως, the storming of a city; in secular authors.

2. (from ἁιρέομαι), choosing, choice, very often in secular writings: the Sept. Leviticus 22:18; 1 Macc. 8:30.

3. that which is chosen, a chosen course of thought and action; hence one's chosen opinion, tenet; according to the context, an opinion varying from the true exposition of the Christian faith (heresy): 2 Peter 2:1 (cf. DeWette at the passage), and in ecclesiastical writings (cf. Sophocles' Lexicon, under the word).

4. a body of men separating themselves from others and following their own tenets (a sect or party): as the Sadducees, Acts 5:17; the Pharisees, Acts 15:5; Acts 26:5; the Christians, Acts 24:5, 14 (in both instances with a suggestion of reproach); (in Diogenes Laërtius 1 (13) 18f, others, used of the schools of philosophy).

5. dissensions arising from diversity of opinions and aims: Galatians 5:20; 1 Corinthians 11:19. (Cf. Meyer, at the passages cited; B. D. American edition under the word ; Burton, Bampt. Lect. for 1829; Campbell, Diss. on the Gospels, diss. iv., part iv.)

Topical Lexicon
Definition and Semantic Range

Strong’s Greek 139 (hairesis) describes a deliberate choice that organizes around a distinctive viewpoint. In Greco-Roman usage it could name a philosophical school; in the New Testament it designates a religious “party,” and, in later apostolic writing, a doctrinal departure so serious that it endangers the gospel itself.

Occurrences in Scripture

Acts 5:17; Acts 15:5; Acts 24:5, 14; Acts 26:5; Acts 28:22; 1 Corinthians 11:19; Galatians 5:20; 2 Peter 2:1.

Historical Background

First-century Judaism was already divided into Pharisees, Sadducees, and Essenes, each called a hairesis by contemporary historians. Luke carries that vocabulary into Acts to describe both Jewish parties and the emerging church. As the gospel spread, outsiders labeled the followers of Jesus a “sect” (Acts 24:5). Paul does not reject the word itself (Acts 24:14) but clarifies that the Way fulfills rather than abandons the Law and the Prophets.

Neutral and Positive Uses in Acts

1. Internal Jewish divisions: “some believers from the sect of the Pharisees” (Acts 15:5).
2. Paul’s former life: “according to the strictest sect of our religion I lived as a Pharisee” (Acts 26:5).
3. Outsider appraisal of Christians: “a ringleader of the sect of the Nazarenes” (Acts 24:5).

These passages show that “sect” could be a simple sociological label without moral judgment.

Shift to Negative Sense in the Epistles

Paul and Peter apply hairesis to divisive teaching inside local assemblies.
1 Corinthians 11:19 – “there must be differences among you to show which of you are approved.” Here factions expose authentic faith by contrast.
Galatians 5:20 lists “factions” among the works of the flesh, treating party-spirit as sin.
2 Peter 2:1 warns of “destructive heresies,” identifying a doctrinal deviation that denies the Lord and brings condemnation.

Doctrinal Significance

The progression from neutral to pejorative reveals the apostolic concern for sound doctrine. Whereas the label could once describe legitimate varieties within Judaism, inside the body of Christ it now signals teaching that fractures fellowship or corrupts the gospel. Scripture therefore distinguishes between secondary preferences and fundamental departures. The church must test every teaching against the whole counsel of God (Acts 20:27) lest a faction become a heresy.

Implications for Church Unity

1. Unity is grounded in revealed truth, not mere institutional togetherness (Ephesians 4:3–6).
2. Differences will surface, but God uses them to affirm those who are “approved” (1 Corinthians 11:19). Faithful leaders address error with both clarity and charity (2 Timothy 2:24–26).
3. Persistent, gospel-denying heresy requires decisive separation (Titus 3:10–11).

Pastoral and Ministry Application

• Guard the pulpit and classroom: “hold firmly to the trustworthy message” (Titus 1:9).
• Cultivate theological literacy so believers can discern party-spirit masquerading as conviction.
• Pursue restoration where possible, recognizing that some will refuse correction (2 Peter 2:1–3).
• Keep Christ central; factions thrive when personalities eclipse the cross (1 Corinthians 1:10–17).

Summary

Hairesis reminds the church that choice matters. Choosing Christ unites; choosing self-made doctrine divides. The same term that once described competing schools now warns of any teaching that rebels against apostolic truth. Fidelity to Scripture preserves both the purity of the gospel and the harmony of God’s people.

Forms and Transliterations
αιρεσεις αιρέσεις αἱρέσεις αιρεσεως αιρέσεως αἱρέσεως αιρεσιν αίρεσιν αἵρεσιν αιρεσις αίρεσις αἵρεσις aireseis aireseos aireseōs airesin airesis haireseis hairéseis haireseos haireseōs hairéseos hairéseōs hairesin haíresin hairesis haíresis
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Interlinear GreekInterlinear HebrewStrong's NumbersEnglishman's Greek ConcordanceEnglishman's Hebrew ConcordanceParallel Texts
Englishman's Concordance
Acts 5:17 N-NFS
GRK: ἡ οὖσα αἵρεσις τῶν Σαδδουκαίων
NAS: his associates (that is the sect of the Sadducees),
KJV: is the sect of the Sadducees,)
INT: which is [the] sect of the Sadducees

Acts 15:5 N-GFS
GRK: ἀπὸ τῆς αἱρέσεως τῶν Φαρισαίων
NAS: But some of the sect of the Pharisees
KJV: of the sect of the Pharisees
INT: of the sect of the Pharisees

Acts 24:5 N-GFS
GRK: τῶν Ναζωραίων αἱρέσεως
NAS: and a ringleader of the sect of the Nazarenes.
KJV: a ringleader of the sect of the Nazarenes:
INT: of the Nazarenes sect

Acts 24:14 N-AFS
GRK: ἣν λέγουσιν αἵρεσιν οὕτως λατρεύω
NAS: they call a sect I do serve
KJV: which they call heresy, so worship I
INT: which they call a sect so I serve

Acts 26:5 N-AFS
GRK: τὴν ἀκριβεστάτην αἵρεσιν τῆς ἡμετέρας
NAS: to the strictest sect of our religion.
KJV: the most straitest sect of our
INT: the strictest sect of the of us

Acts 28:22 N-GFS
GRK: γὰρ τῆς αἱρέσεως ταύτης γνωστὸν
NAS: this sect, it is known
KJV: as concerning this sect, we know
INT: indeed the sect this known

1 Corinthians 11:19 N-NFP
GRK: γὰρ καὶ αἱρέσεις ἐν ὑμῖν
NAS: also be factions among
KJV: be also heresies among you,
INT: indeed also factions among you

Galatians 5:20 N-NFP
GRK: ἐριθείαι διχοστασίαι αἱρέσεις
NAS: disputes, dissensions, factions,
KJV: strife, seditions, heresies,
INT: contentions dissentions factions

2 Peter 2:1 N-AFP
GRK: οἵτινες παρεισάξουσιν αἱρέσεις ἀπωλείας καὶ
NAS: destructive heresies, even
KJV: damnable heresies, even
INT: who will bring in stealthily heresies destructive and

Strong's Greek 139
9 Occurrences


αἱρέσεις — 3 Occ.
αἱρέσεως — 3 Occ.
αἵρεσιν — 2 Occ.
αἵρεσις — 1 Occ.

138
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