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Matthew 13:33
He told them still another parable: “The kingdom of heaven is like leaven that a woman took and mixed into three measures of flour, until all of it was leavened.”
1 Corinthians 5:6, 7
Your boasting is not good. Do you not know that a little leaven works through the whole batch of dough? / Get rid of the old leaven, that you may be a new unleavened batch, as you really are. For Christ, our Passover lamb, has been sacrificed.