1 Corinthians 5

7 *5:7 Paul is using the Passover celebration as an analogy. Leading up to the Passover meal was the Feast of Unleavened Bread (Ex 12:17-20), during which the Israelites were to remove all leaven from their homes to symbolize the removal of sin from their lives. Leaven (yeast) was often used as a symbol of spiritual corruption.Clean out the old leaven so that you may be a new batch, just as you are, still unleavened. For Christ our Passover Lamb has been sacrificed.