1 Corinthians 5:11-13

11But actually, I have written to you not to associate with any so-called [Christian] brother if he is sexually immoral or greedy, or is an idolater [devoted to anything that takes the place of God], or is a reviler [who insults or slanders or otherwise verbally abuses others], or is a drunkard or a swindler—you must not so much as eat with such a person.

12For what business is it of mine to judge outsiders (non-believers)? Do you not judge those who are within the church [to protect the church as the situation requires]?

13God alone sits in judgment on those who are outside [the faith]. Remove the wicked one from among you [expel him from your church].