Bible: 1 Cor. 5:1, 11
5:1 It is actually reported that sexual immorality exists among you, the kind of immorality that is not permitted even among the Gentiles, so that someone is cohabiting with 1 his father’s wife. 5:11 But now I am writing to you not to associate with anyone who calls himself a Christian 2 who is sexually immoral, or greedy, or an idolater, or verbally abusive, 3 or a drunkard, or a swindler. Do not even eat with such a person.