1 Corinthians 5:6-6:8
Your boasting is not a good thing. Do you not know that a little yeast leavens the whole batch of dough? Clean out the old yeast so that you may be a new batch, as you really are unleavened. For our paschal lamb, Christ, has been sacrificed. Therefore, let us celebrate the festival, not with the old yeast, the yeast of malice and evil, but with the unleavened bread of sincerity and truth.
Sexual Immorality Must Be Judged
I wrote to you in my letter not to associate with sexually immoral persons—not at all meaning the immoral of this world, or the greedy and robbers, or idolaters, since you would then need to go out of the world. But now I am writing to you not to associate with anyone who bears the name of brother or sister who is sexually immoral or greedy, or is an idolater, reviler, drunkard, or robber. Do not even eat with such a one. For what have I to do with judging those outside? Is it not those who are inside that you are to judge? God will judge those outside. “Drive out the wicked person from among you.”
Lawsuits among Believers
When any of you has a grievance against another, do you dare to take it to court before the unrighteous, instead of taking it before the saints? Do you not know that the saints will judge the world? And if the world is to be judged by you, are you incompetent to try trivial cases? Do you not know that we are to judge angels—to say nothing of ordinary matters? If you have ordinary cases, then, do you appoint as judges those who have no standing in the church? I say this to your shame. Can it be that there is no one among you wise enough to decide between one believer and another, but a believer goes to court against a believer—and before unbelievers at that?
In fact, to have lawsuits at all with one another is already a defeat for you. Why not rather be wronged? Why not rather be defrauded? But you yourselves wrong and defraud—and believers at that.