Romans 11:16 If the first fruit is holy, so is the lump. If the root is holy, so are the branches. (See NIV)
1 Corinthians 5:6 Your boasting is not good. Don't you know that a little yeast leavens the whole lump? (See NIV)
1 Corinthians 5:7 Purge out the old yeast, that you may be a new lump, even as you are unleavened. For indeed Christ, our Passover, has been sacrificed in our place. (See NIV)
Galatians 5:9 A little yeast grows through the whole lump. (See NIV)