1 Corinthians 5:1-2, 6

It’s been widely reported that there is gross sexual immorality among you—the kind of immorality that’s so revolting it’s not even tolerated by the social norms of unbelievers. Are you proud of the fact that one of your men is having sex with his stepmother? Shouldn’t this heartbreaking scandal bring you to your knees in tears? You must remove the offender from among you!

Boasting over your tolerance of sin is inappropriate. Don’t you understand that even a small compromise with sin permeates the entire fellowship, just as a little leaven permeates a batch of dough?