I Corinthians 5
5 I can hardly believe the report about the sexual immorality going on among you—something that even pagans don’t do. I am told that a man in your church is living in sin with his stepmother. 2 You are so proud of yourselves, but you should be mourning in sorrow and shame. And you should remove this man from your fellowship.
3 Even though I am not with you in person, I am with you in the Spirit. And as though I were there, I have already passed judgment on this man 4 in the name of the Lord Jesus. You must call a meeting of the church. I will be present with you in spirit, and so will the power of our Lord Jesus. 5 Then you must throw this man out and hand him over to Satan so that his sinful nature will be destroyed and he himself[e] will be saved on the day the Lord[f] returns.
6 Your boasting about this is terrible. Don’t you realize that this sin is like a little yeast that spreads through the whole batch of dough? 7 Get rid of the old “yeast” by removing this wicked person from among you. Then you will be like a fresh batch of dough made without yeast, which is what you really are. Christ, our Passover Lamb, has been sacrificed for us. 8 So let us celebrate the festival, not with the old bread of wickedness and evil, but with the new bread[i] of sincerity and truth.
9 When I wrote to you before, I told you not to associate with people who indulge in sexual sin. 10 But I wasn’t talking about unbelievers who indulge in sexual sin, or are greedy, or cheat people, or worship idols. You would have to leave this world to avoid people like that. 11 I meant that you are not to associate with anyone who claims to be a believer yet indulges in sexual sin, or is greedy, or worships idols, or is abusive, or is a drunkard, or cheats people. Don’t even eat with such people.
12 It isn’t my responsibility to judge outsiders, but it certainly is your responsibility to judge those inside the church who are sinning. 13 God will judge those on the outside; but as the Scriptures say, “You must remove the evil person from among you.”
The Church is to judge sin. Matthew 7 says I am not to judge others, only myself. But the Church is supposed to judge sin. The pattern is in Matthew 18. But the Church doesn’t do that today, and therefore the “yeast” of sin has weakened the moral character of the Church. Paul expands it beyond sexual sin to include greed, abuse, the worship of idols, and cheating other people. Wow! Would that ever shrink the size of the Church! But Paul says it would increase the power of the Church.
The Church is to judge the life of the believer and at the same time embrace the outsider–the sinner. It seems we have it backwards. We judge the culture and ignore the behavior of believers.