What Does the Bible Say About Sin in the Church? Lessons from 1 Corinthians 5

Sin is not a comfortable topic. But ignoring it never makes it go away. In 1 Corinthians 5, the apostle Paul addresses a church that had grown comfortable with unrepentant sin in its midst, and his words are just as relevant today as they were then.

Is the Church Supposed to Be Perfect?

The church has never been perfect. It never will be. The church in Corinth was filled with arguments, jealousy, immorality, false teachers, lawsuits, pride, and division. Paul did not hide this. God does not airbrush the history of the church.

People often say they do not attend church because it is full of hypocrites. But here is the truth: our faith is not built on the perfection of Christians. It is built on the perfection of Christ.

When leaders fail, when churches disappoint, when people let you down, Jesus remains holy. He has never sinned. He has never made a wrong decision. He will never be unfaithful to you.

Does Love Mean Acceptance? What the Bible Actually Says

One of the greatest lies in our culture is that love means acceptance. The church in Corinth believed this lie, and it cost them dearly.

Christlike love is not the same as unconditional acceptance. Christlike love is a holy love. It does not accept people as they are and leave them there. It invites them to become what God created them to be.

The gospel does not say you are fine the way you are. The gospel says God loves you so much that you cannot stay the way you are.

As parents, we understand this instinctively. We do not let our children play in traffic because we want them to feel accepted. We set boundaries because we love them and want what is best for them. God operates the same way.

• The world says: “If you love me, you will affirm me.”
• Jesus says: “If you love me, you will keep my commandments.” (John 14:15, ESV)

What Was the Real Problem in the Corinthian Church?

Paul had received a report that a man in the church was living in ongoing sexual immorality, a relationship so scandalous that even the surrounding pagan culture was talking about it.

But Paul’s concern was not only the sin itself. His concern was the response of the church to that sin. The church was not mourning over it. They were proud of their tolerance toward it.

Paul writes in 1 Corinthians 5:2, “And you are arrogant! Ought you not rather to mourn? Let him who has done this be removed from among you.” (1 Corinthians 5:2, English Standard Version (ESV))

The word “mourn” here is the most powerful word in the New Testament used to describe grief. Paul is saying the church should have the kind of broken heart over sin that one has when losing a loved one. Instead, they were boasting.

What Happens When the Church Ignores Sin?

On June 5, 1976, the Teton Dam in eastern Idaho collapsed. It started with a small muddy leak on the side of the dam. It seemed manageable at first. Within hours, the entire dam gave way, releasing 80 billion gallons of water, causing $2 billion in damages, and claiming 11 lives.

Ignoring a known problem never makes it disappear. It only makes the consequences greater.

Paul understood this. He writes in 1 Corinthians 5:6, “Your boasting is not good. Do you not know that a little leaven leavens the whole lump?” (1 Corinthians 5:6, English Standard Version (ESV))

Leaven was used in scripture as a picture of sin because of how easily it spreads. Left unchecked, sin never stays contained. It grows.

But here is the good news. Grace works the same way. Sin spreads when it is hidden. Grace spreads when sin is confessed. As 1 John 1:9 reminds us, “If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.” (1 John 1:9, English Standard Version (ESV))

What Is Church Discipline and Why Does It Matter?

Paul instructs the church to remove the unrepentant man from the fellowship. This sounds harsh. But the purpose is not punishment. The purpose is restoration.

Paul writes in 1 Corinthians 5:5, “You are to deliver this man to Satan for the destruction of the flesh, so that his Spirit may be saved in the day of the Lord.” (1 Corinthians 5:5, English Standard Version (ESV))

The local body of believers is a gift from God. When we are actively connected to the church, worshiping together, praying for one another, and encouraging each other, God uses that community as spiritual protection. Removing someone from that fellowship means removing them from that covering, with the hope that the consequences they experience will bring them back to Christ.

Think of the prodigal son in Luke 15. He hit rock bottom living among the pigs. That pain became the tool God used to bring Him home. Church discipline carries the same goal. It is not done out of anger or self-righteousness. It is done out of love, with a heart to see that person restored.

Jesus Himself taught this pattern in Matthew 18, outlining a process of private confrontation, then a small group, then church leadership, and finally the broader body of believers.

Does “Judge Not” Mean We Can Never Confront Sin?

Matthew 7:1 is one of the most quoted verses in the Bible, even by people who rarely open one. “Judge not, that you be not judged.” (Matthew 7:1, English Standard Version (ESV))

But Jesus did not mean that confronting sin is wrong. He spent His entire ministry confronting people. He challenged religious leaders. He called people to repentance. He warned about the danger of rejecting God.

What Jesus condemned was a harsh, self-righteous, condemning Spirit. The attitude of “I am better than you, so let me tell you how bad you are.” That is hypocritical judgment.

Loving someone enough to speak truth into their life is not the same thing. God loves us enough to tell us the truth because He knows that stepping outside His boundaries only brings greater consequences and brokenness.

Should Christians Associate with Sinners?

Paul clarifies an important distinction in 1 Corinthians 5:9-11. He had previously told the church not to associate with sexually immoral people. They misunderstood him to mean they should avoid all sinners entirely.

Paul corrects this. If Christians never associated with sinners, no one would ever hear the gospel. We are called to go into the world and share the good news.

The distinction Paul makes is between someone outside the church who does not know Christ and someone inside the church who claims to follow Jesus while living in unrepentant sin. The church welcomes everyone. But it cannot affirm everything.

Jesus welcomed tax collectors, prostitutes, adulterers, and religious failures. What they all had in common was that they came to Him with a repentant heart. Jesus never said stay the way you are. He always said, “Take up your cross and follow me.” (Luke 9:23, English Standard Version (ESV))

What Does This Mean for Your Personal Life?

There is a difference between falling into sin and choosing to live in it. If you stumbled this week and you are convicted, if you are seeking Christ and seeking forgiveness, run to Him. He is waiting. He will forgive you.

The gospel is for both sinners and sufferers. Jesus not only forgives our sins. He carries our burdens. He redeems our failures and walks with us through suffering. Whatever you brought into this week, you do not have to carry it alone.

Life Application

This week, take an honest look at your own life. Paul’s challenge to the Corinthian church begins with a simple but difficult step: face sin honestly. Not to condemn yourself, but to experience the freedom and grace that comes when you stop hiding and start confessing.

Identify one area of your life where you have been tolerating something you know does not honor God. Bring it before Him in prayer. If it helps, share it with a trusted friend or mentor who can walk alongside you in accountability.

Ask yourself these questions this week:

• Is there a sin in my life I have been ignoring or making peace with rather than bringing to God?
• Am I confusing love with acceptance in my relationships, either by affirming what I should gently challenge or by staying silent when someone I care about needs to hear the truth?
• Am I actively connected to a local church body where I can both give and receive the spiritual protection and accountability that God designed community to provide?
• When I think about God’s boundaries and commands, do I see them as restrictive or as an expression of His love for me?

God loves you too much to leave you where you are. His boundaries are not walls to keep you in. They are guardrails to keep you safe. Face sin honestly, seek restoration lovingly, and trust that His grace is more than enough.