Objectively, trustworthy; subjectively, trustful
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The Greek adjective pistos is one of the New Testament's most theologically load-bearing words. Derived from the same root as pistis (G4102, faith), it operates in two complementary directions: it describes something or someone as worthy of trust (faithful, reliable, trustworthy — the objective sense), and it describes someone who actively trusts (believing, a person of faith — the subjective sense).
Reader summary
Full entry for πιστός (G4103) · Open the biblical lexicon
The Greek adjective pistos is one of the New Testament's most theologically load-bearing words. Derived from the same root as pistis (G4102, faith), it operates in two complementary directions: it describes something or someone as worthy of trust (faithful, reliable, trustworthy — the objective sense), and it describes someone who actively trusts.
The BSB source-word alignment has 67 aligned rows for this entry. Common renderings include faithful (31), [is] faithful (5), believe (3), believers (3), [This is a] trustworthy (2).
The source-word alignment first shows this entry at Matthew 24:45. Its strongest book concentrations include 1 Timothy (11), Revelation (8), Luke (6), 1 Corinthians (5).
The Greek adjective pistos is one of the New Testament's most theologically load-bearing words. Derived from the same root as pistis (G4102, faith), it operates in two complementary directions: it describes something or someone as worthy of trust (faithful, reliable, trustworthy — the objective sense), and it describes someone who actively trusts (believing, a person of faith — the subjective sense).
Context usually makes clear which direction is in view, but the overlap is deliberate: the character of God as faithful is the ground on which human faith rests. When Paul writes 'God is faithful' (1 Cor. 1:9), he is not simply praising a divine attribute — he is establishing the bedrock on which the Corinthians' shaken confidence can stand. When he describes an elder as 'faithful' (Tit.
1:6) Or a servant as 'faithful and dear' (Eph. 6:21), he is commending the human virtue that mirrors the divine. The word spans the whole biblical theology of covenant: Yahweh is the faithful God who keeps covenant (Deut. 7:9), and the calling of his people is to become, by grace, faithful in return. For the preacher, pistos is a window into the grammar of the covenant relationship — reliability moving in both directions, from God to his people and from his people toward him and one another.
Pistos appears approximately 67 times in the New Testament, with its highest concentration in the Pauline letters, the Pastoral Epistles, and Revelation. It modifies God (1 Cor. 1:9; 1 Thes. 5:24; 2 Thes. 3:3), Christ (Rev. 1:5; 3:14; 19:11), human servants and elders (Eph. 6:21; 1 Tim. 1:12; Tit. 1:6), and — in a related but distinct sense — those who believe (Acts 10:45; 16:1).
The Lamentations passage (3:23) provides the Old Testament anchor through which the word's Hebrew equivalent (ʾāman and its cognates) informs the New Testament usage.
God, who has called you into fellowship with His Son Jesus Christ our Lord, is faithful.
Paul's great anchor statement at the opening of a letter addressed to a fractured church. The Corinthians' unity, calling, and standing all rest not on their own consistency but on God's faithfulness. This is one of the most important pistos statements in the NT: it establishes divine reliability as the theological foundation for everything that follows in the letter.
He who calls you is faithful, who will also do it.
Paul's compressed but powerful claim: the same God who issues the call will carry it through. Pistos here is the guarantee that the divine summons is not a conditional offer but a reliable purpose. The verse grounds sanctification (5:23) in divine faithfulness rather than human willpower — a profoundly pastoral framing.
But the Lord is faithful, who will establish you and guard you from the evil one.
In a letter concerned with persecution and disillusionment, pistos provides the stable centre. God's faithfulness is not a vague attribute but a protective and establishing reality — it has a direction and an object: you. This is pastoral theology at its most concrete.
And from Jesus Christ, the faithful witness, the firstborn from the dead, and the ruler of the kings of the earth. To Him who loves us and has released us from our sins by His blood,
Revelation opens by applying pistos to Christ himself, linking faithfulness to his role as the supreme witness (martys). The faithful witness does not shade or retract his testimony; he speaks the whole truth even when it costs everything — and Christ's faithful witness cost him his life. This usage connects pistos to the martyr tradition and to the call for disciples to be faithful under pressure (Rev. 2:10).
They are new every morning; great is Your faithfulness!
While the LXX here uses a different Greek term, the Hebrew background (ʾemûnāh, from the same root as ʾāman) informs the NT use of pistos. Lamentations 3:23 is the Old Testament anchor for the concept that God's faithfulness is not exhausted by suffering or exile — it renews itself each morning. New Testament writers who call God pistos are drawing on this deep canonical tradition.
Know therefore that the Lord your God is God, the faithful God who keeps His covenant of loving devotion for a thousand generations of those who love Him and keep His commandments.
The Deuteronomy background is essential: faithfulness (Hebrew ʾemet / ʾemûnāh) is the quality by which Yahweh keeps his covenant even when Israel breaks its side. The NT application of pistos to God is a direct inheritance from this stream of covenantal theology.
BSB source-word alignment connects this entry to exact verse rows, English rendering, source form, transliteration, and parsing.
How English Renders ItA compact distribution from source-word alignment before the full evidence tables.
Greek word. Dual nature: passive sense means trustworthy/reliable; active sense means believing/faithful in trust.
Textus Receptus witness, full corpus Greek token appearances from Scrivener 1894 Textus Receptus in the full New Testament corpus.
16 of 67 Greek text appearances shown. Linked morphology labels have verse guides.
trustworthy, faithful, believing
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Read versetrustworthy, faithful, believing
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Read versetrustworthy, faithful, believing
Read versetrustworthy, faithful, believing
Read versetrustworthy, faithful, believing
Read versetrustworthy, faithful, believing
Read versetrustworthy, faithful, believing
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Read versetrustworthy, faithful, believing
Read versetrustworthy, faithful, believing
Read versetrustworthy, faithful, believing
Read verseFull New Testament corpus: 260 chapters, 7,957 verses, 140,628 tokens. Data source: honza/textus-receptus (data only), with authority check against byztxt/greektext-textus-receptus.
How this word appears across different grammatical cases and numbers.
This word appears as a noun across 10 case and number patterns. The form changes show how the word functions in a sentence; they do not change the basic lexical meaning by themselves.
Verse guides are not available for this word yet, so verse references remain plain evidence markers.
Selected passage-level study witnesses for this word. This section is not the full occurrence list.
Showing 5 selected witnesses from 67 lexical occurrence verses.
πιστός is built from this root:
God’s covenant reliability remains intact despite human unbelief.
Trust rooted in revelation.
The believer’s ultimate hope rests in the unwavering character of God.
Assures believers that forgiveness rests on God’s covenant reliability. 2 Timothy 2:8-13
Compound and idiomatic phrases that include this word. Follow a link to study the phrase and how its parts work together.
The great pastoral gift of pistos is that it locates the security of the believer not in human consistency but in divine reliability. Many NT statements that call God or Christ 'faithful' is functioning as a pastoral anchor — it is written to people who are tired, afraid, fractured, or persecuted, and it says to them: the ground beneath you does not shift. The preacher who opens pistos discovers that the New Testament's reassurance to struggling believers is not first 'you are doing well enough' but 'God is faithful.'
This distinction matters enormously in pastoral work. It means the exhortation to be faithful is secondary to the declaration that God is faithful — the human virtue is a response to and participation in the divine reality, not the other way around. The Pastoral Epistles' repeated demand for faithfulness in elders and servants is not a works-righteousness standard; it is an invitation to embody, in creaturely form, the reliability that characterizes God himself.
When Christ is called 'the faithful witness' in Revelation, faithfulness is shown to have a cost — the witness who will not retract his testimony even under pressure is the model for the church across seasons of trial.
1Cor.1.9
Pistos is an adjective formed from the verb pisteuō (to believe, trust). The same root yields pistis (faith, trust), pisteutos (worthy of belief), and apistia (unbelief). This word-family makes it grammatically impossible to separate the concept of faithfulness from the concept of faith: to be pistos is to be the kind of person or being in whom faith can properly be placed, and faith is the appropriate response to encountering someone who is pistos.
The LXX uses pistos to translate the Hebrew neʾĕmān (trustworthy, confirmed, established), from ʾāman — the root of 'amen.'
The Old Testament background of pistos runs through the Hebrew root ʾ-m-n: the neʾĕmān (faithful/established) and ʾemûnāh (faithfulness) vocabulary of the Psalms and Deuteronomy. Deuteronomy 7:9 names Yahweh as 'the faithful God' who keeps covenant — this is the canonical starting point. The prophets pick it up in Lamentations 3:23 and Isaiah 49:7, where divine faithfulness is the horizon even in desolation.
When Paul opens his letters by declaring 'God is faithful,' he is anchoring his pastoral theology in that entire OT tradition. Revelation brings pistos to its Christological summit by applying it to Jesus as the faithful and true witness (Rev. 1:5; 3:14; 19:11), the one who in his death and resurrection enacts the ultimate reliability of God's covenant purposes.
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