1 Corinthians 5:9-11

I wrote to you in a letter not to associate with sexually immoral people. I did not mean the immoral people of this world or the greedy and swindlers or idolaters; otherwise you would have to leave the world. But actually, I wrote you not to associate with anyone who claims to be a brother or sister and is sexually immoral or greedy, an idolater or verbally abusive, a drunkard or a swindler. Do not even eat with such a person.