1 Corinthians 5:5-9

I have decided to turn such a person over to Satan for the destruction of his body, so that his spirit may be saved on the day of the Lord.

Your boasting is not good. Do you not know that a little leaven leavens the whole lump of dough?

Clean out the old leaven so that you may be a new lump, just as you are in fact unleavened. For Christ our Passover also has been sacrificed.

Therefore let’s celebrate the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.

I wrote to you in my letter not to associate with sexually immoral people;