1 Peter 1:16ESV
since it is written, 'You shall be holy, for I am holy.'
Peter quotes Leviticus directly, anchoring the command to God's own nature. The call to hagios living flows from who God is, not from a moral checklist.
Greek word · FaithLabz word study
ἅγιος
hagios
holy, set apart
Often translated: holysaintssacredconsecratedset apart
What hagios means
The Greek word hagios carries a meaning that goes deeper than moral goodness. At its core, hagios means 'set apart,' 'consecrated,' or 'belonging to another category entirely.' When the New Testament authors reach for this word, they are not primarily saying something is good or clean. They are saying it belongs to a different order of existence.
Think of it this way. A priest's garments weren't holy because they were spotless. They were holy because they had been set apart for the temple, removed from ordinary use, devoted entirely to God. That's the texture of hagios. The word marks off a boundary between what is ordinary and what has been claimed by the divine.
This is why the Spirit is called the Holy Spirit, the Pneuma Hagion. The Spirit is not just morally pure. The Spirit is the very breath of the set-apart God, carrying His nature into the world. When believers are called hagioi, the New Testament word for 'saints,' Paul isn't calling them morally superior people. He's calling them people who have been pulled out of the ordinary and consecrated to God.
Hagios also carries a relational weight. To be hagios is to belong to someone. Holiness in the New Testament is never a solo performance. It's a status conferred by God's act of claiming you. That's why Peter echoes Leviticus when he writes 'be holy, for I am holy.' The call to holiness is grounded in God's own nature and His decision to make you His.
Why this word matters
Most of us grew up hearing 'holy' and picturing someone who never swears and keeps a tidy devotional life. I carried that picture for years. It made holiness feel like a personality type I wasn't born with.
But hagios isn't about spiritual tidiness. It's about ownership and distance from the ordinary. When God calls something holy, He is saying it now belongs to Him and can't be treated like everything else. When He calls you holy in Christ, He isn't grading your performance. He is marking you as His.
That doesn't dissolve the call to live differently. It actually deepens it. You pursue holiness not to earn the status but because the status is already real. You already belong to Him. The life you live should say so.
Etymology
Hagios likely derives from the root hagos, a term of awe or religious dread in classical Greek, connected to things that inspired reverential fear because of their sacred power. Related forms include hagiazō (to sanctify or make holy), hagiotēs (holiness as a quality), and hagiosmos (sanctification as a process). The Hebrew equivalent tying this concept together is qodesh, the root behind Israel's worship vocabulary. The Septuagint, the Greek Old Testament, uses hagios to translate qodesh hundreds of times, loading the Greek word with all of Israel's priestly and temple theology.
Key Verses
Where hagios appears in Scripture, and why each verse showcases it.
Romans 1:7ESV
To all those in Rome who are loved by God and called to be saints:
Paul addresses ordinary Roman believers as hagioi, saints, before he gives them a single instruction. The status precedes the conduct.
Revelation 4:8ESV
And the four living creatures, each of them with six wings, are full of eyes all around and within, and day and night they never cease to say, 'Holy, holy, holy, is the Lord God Almighty, who was and is and is coming!'
The triple repetition amplifies the superlative in Hebrew fashion. God is not merely holy; He is the source and standard of all that hagios means.
1 Corinthians 1:2ESV
To the church of God that is in Corinth, to those sanctified in Christ Jesus, called to be saints together with all those who in every place call upon the name of our Lord Jesus Christ, both their Lord and ours:
Paul calls a deeply troubled congregation hagioi. The word is a given identity, not an achieved grade, which is the whole point of his letter.
John 17:11ESV
And I am no longer in the world, but they are in the world, and I am coming to you. Holy Father, keep them in your name, which you have given me, that they may be one, even as we are one.
Jesus addresses the Father as Holy Father, hagios Pater, grounding the disciples' protection in the Father's very nature as the set-apart God.
Related Words
Words in the same semantic family.
2 Teachings on hagios
Every video where Adam teaches on this word, in publication order.
word study
Hagios: God Gave Saints the Same Word as His Spirit
Exploring how hagios applies to both God's Spirit and His saints, revealing shared divine nature.
word study
Hagios: You Are Not Riding the Bench
Exploring hagios to show believers they are actively set apart for God's purpose, not sidelined.
Featured In
This word is studied in depth in the following monthly Bible studies.