1 Corinthians 5:6-11

6Your boasting is not good. Don’t you know that a little yeast leavens the whole batch of dough? 7Get rid of the old yeast, so that you may be a new unleavened batch—as you really are. For Christ, our Passover lamb, has been sacrificed.

8Therefore let us keep the Festival, not with the old bread leavened with malice and wickedness, but with the unleavened bread of sincerity and truth. 9I wrote to you in my letter not to associate with sexually immoral people— 10not at all meaning the people of this world who are immoral, or the greedy and swindlers, or idolaters. In that case you would have to leave this world.

11But now I am writing to you that you must not associate with anyone who claims to be a brother or sister The Greek word for brother or sister (adelphos) refers here to a believer, whether man or woman, as part of God’s family; also in 8:11, 13. but is sexually immoral or greedy, an idolater or slanderer, a drunkard or swindler. Do not even eat with such people.