1 Corinthians 5:5-7

5:5 turn this man over to Satan for the destruction of the flesh, so that his spirit may be saved in the day of the Lord.

5:6 Your boasting is not good. Don’t you know that a little yeast affects the whole batch of dough? 5:7 Clean out the old yeast so that you may be a new batch of dough – you are, in fact, without yeast. For Christ, our Passover lamb, has been sacrificed.