1 Corinthians 5:3-7
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Immorality Defiles the Church
3For I indeed, as absent in body but present in spirit, have already judged (as though I were present) him who has so done this deed. 4In the name of our Lord Jesus Christ, when you are gathered together, along with my spirit, with the power of our Lord Jesus Christ, 5deliver such a one to Satan for the destruction of the flesh, that his spirit may be saved in the day of the Lord Jesus.
6Your glorying is not good. Do you not know that a little leaven leavens the whole lump? 7Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us.
1 Corinthians 5:3-7 (NKJV)