1 Corinthians 5 Summary — Church Discipline and Cleansing Out the Leaven

Companion: Deep Study

A condensed companion to the full study. For each section of the expanded outline: key insights, applications, and the application questions for discussion.

Section 1 — The Scandal and the Church’s Arrogance (1 Corinthians 5:1–2)

Key Insights

A man was living with “his father’s wife” — a case of incest so grave it was “not tolerated even among pagans,” violating both Mosaic law (Leviticus 18:8) and Roman law.
Paul’s sharpest rebuke falls not on the offender but on the church: “And you are arrogant! Ought you not rather to mourn?”
The Corinthians were puffed up amid scandal, when the fitting response to flagrant sin in the body is grief, not boasting.
The remedy is plain: “Let him who has done this be removed from among you” — anticipating excommunication and echoing Deuteronomy’s “purge the evil.”
The church, as the holy temple of the Spirit, cannot harbor open, defiant sin without dishonoring her Lord.

Applications

Respond to flagrant sin in the church with mourning, not a self-congratulating tolerance.
Let Scripture, not the surrounding culture, shape your conscience about sexual purity.
Embrace the loving necessity of removing an unrepentant member, neither harsh nor complacent.

Application Questions

When I encounter flagrant sin in the church, do I respond with mourning, or have I grown comfortable and even proud of my tolerance?
Have I allowed the surrounding culture’s sexual ethics to shape my conscience more than the Word of God?

Section 2 — The Apostolic Verdict: Deliver Him to Satan (1 Corinthians 5:3–5)

Key Insights

Though absent in body, Paul has “already pronounced judgment” — rendering a definite, authoritative apostolic verdict, not vague sentiment.
Discipline is a corporate, solemn act of the assembled church, done “in the name of the Lord Jesus” and “with the power of our Lord Jesus.”
To “deliver this man to Satan” is to put the unrepentant outside the church’s protective fellowship and means of grace, into Satan’s realm.
The aim is unmistakably redemptive: “for the destruction of the flesh, so that his spirit may be saved in the day of the Lord.”
The most painful discipline is a severe mercy, designed to bring the sinner to repentance, not to destroy him.

Applications

View church discipline as an act of love aimed at restoration, supporting it with prayer and grief, not gossip.
Submit humbly to the lawful correction of the church as part of God’s appointed safety.
Reject both vindictive harshness and a sentimental tolerance that abandons a brother to his sin.

Application Questions

Do I view church discipline as an act of love aimed at restoration, or as harsh and unloving?
Am I willing to submit humbly to the lawful correction of the church, or do I resist all accountability?

Section 3 — A Little Leaven and Christ Our Passover (1 Corinthians 5:6–8)

Key Insights

“A little leaven leavens the whole lump” — tolerated sin does not stay contained but permeates and corrupts the whole body.
“Cleanse out the old leaven… as you really are unleavened” — the church must become in practice what she already is in Christ (indicative grounds imperative).
The ground of the whole exhortation: “Christ, our Passover lamb, has been sacrificed” — the cross fulfills Exodus 12 and motivates holiness.
The Christian life is a perpetual Feast of Unleavened Bread, kept “with the unleavened bread of sincerity and truth,” not “the leaven of malice and evil.”
Holiness flows from the finished work of Christ, not from self-reliant moralism.

Applications

Take “small” or hidden sins seriously and deal with them decisively before they spread.
Root your pursuit of holiness in Christ your Passover, not in mere duty or fear.
Put away the leaven of malice and evil, feeding on sincerity and truth; become what you are in Christ.

Application Questions

Do I take “small” sins seriously, or do I assume they can be tolerated without consequence?
Is the motive for my pursuit of holiness the finished work of Christ my Passover, or mere duty and fear?

Section 4 — Not to Associate with an Immoral Brother (1 Corinthians 5:9–11)

Key Insights

Paul clarifies he never meant avoiding the immoral “of this world” — to do so “you would need to go out of the world”; the church is sent into the world, not out of it.
The discipline applies to “anyone who bears the name of brother” yet lives in flagrant, unrepented sin.
The catalog of sins extends beyond sexual immorality to greed, idolatry, reviling, drunkenness, and swindling.
“Not even to eat with such a one” signals the withdrawal of table fellowship, including the Lord’s Supper, marking a contradicted profession.
The exclusion is restorative in intent: by feeling the loss of fellowship, the sinner may be brought to repentance.

Applications

Engage unbelievers freely as Christ’s witnesses, refusing a fearful Christian-bubble separatism.
Exercise loving discipline toward a professing believer in unrepented sin rather than excusing it for false peace.
Withhold fellowship as a tool of restoration, warning the offender “as a brother,” not an enemy.

Application Questions

Do I engage unbelievers freely for the sake of the gospel, or have I withdrawn into a Christian bubble?
Am I willing to exercise loving discipline toward a professing believer in unrepented sin, or do I excuse it for the sake of false peace?

Section 5 — Judging Those Inside and Purging the Evil (1 Corinthians 5:12–13)

Key Insights

“Is it not those inside the church whom you are to judge?” — the church’s corrective judgment is directed inward, toward its own members.
“God judges those outside” — the final judgment of the unbelieving world belongs to God alone, not to the church.
The chapter closes by quoting Deuteronomy: “Purge the evil person from among you” — grounding discipline in God’s abiding will.
The quotation places the new covenant church in continuity with Israel as the holy people of God who must not harbor unrepented evil.
Discipline is rooted not in pragmatism but in the holiness of God and His covenant people.

Applications

Direct your moral concern to the holiness of God’s people, beginning with yourself, not to condemning the world.
Rest content to leave the judgment of the unbelieving world to God, engaging them with the gospel.
Tend the holiness of Christ’s church through loving accountability, not self-righteous judgmentalism.

Application Questions

Do I direct my moral energy toward judging the world’s sins while excusing sin within the church and myself?
Am I content to leave the judgment of the unbelieving world to God, or do I usurp His role?

Because Christ our Passover Lamb has been sacrificed for us, the church is summoned to be what she already is in Him — a new, unleavened lump, purged of corruption and kept in sincerity and truth. The discipline of 1 Corinthians 5 is no cold severity but the severe mercy of a holy God, who through the cross redeems a people for Himself and, even in His sharpest correction, seeks that the sinner’s spirit may be saved in the day of the Lord.