1 Corinthians 5:12-6:6

12What business is it of mine to judge those outside the church? Are you not to judge those inside? 13God will judge those outside. “Expel the wicked person from among you.” Deut. 13:5; 17:7; 19:19; 21:21; 22:21,24; 24:7

Lawsuits Among Believers 1If any of you has a dispute with another, do you dare to take it before the ungodly for judgment instead of before the Lord’s people? 2Or do you not know that the Lord’s people will judge the world? And if you are to judge the world, are you not competent to judge trivial cases? 3Do you not know that we will judge angels? How much more the things of this life! 4Therefore, if you have disputes about such matters, do you ask for a ruling from those whose way of life is scorned in the church? 5I say this to shame you. Is it possible that there is nobody among you wise enough to judge a dispute between believers?

6But instead, one brother takes another to court—and this in front of unbelievers!