1 Corinthians 5:9-11

9I already wrote a letter to you. I told you that you must not be friends with people who have sex in wrong ways.

10But I was not talking about people who do not know God. Those people have sex in wrong ways. They want many things to please themselves. They deceive people and they rob them. They worship idols. You could not keep away from all people like that, unless you left this world!

11Now I am telling you this: I was talking about people who say that they are believers. If they say that, but they have sex in a wrong way, do not be friends with them. It is the same if they want many things for themselves. They may worship idols. They may insult people. They may often get drunk. They may deceive people and rob them. If one of your own group does things like that, do not even agree to eat a meal with them.