5:11. But now I have written to you, not to keep company, if any man that is named a brother be a fornicator or covetous or a server of idols or a railer or a drunkard or an extortioner: with such a one, not so much as to eat.
5:12. For what have I to do to judge them that are without? Do not you judge them that are within?
5:13. For them that are without, God will judge. Put away the evil one from among yourselves.
1 Corinthians Chapter 6
He blames them for going to law before unbelievers. Of sins that exclude from the kingdom of heaven. The evil of fornication.
6:1. Dare any of you, having a matter against another, go to be judged before the unjust: and not before the saints?
6:2. Know you not that the saints shall judge this world? And if the world shall be judged by you, are you unworthy to judge the smallest matters?
6:3. Know you not that we shall judge angels? How much more things of this world?
6:4. If therefore you have judgments of things pertaining to this world, set them to judge who are the most despised in the church.
6:5. I speak to your shame. Is it so that there is not among you any one wise man that is able to judge between his brethren?