Matthew 16:12
Then they realized that what he told them to beware of was not leaven but the teaching of the Pharisees and Sadducees.
Matthew 26:26
As they were eating he took a loaf and after the blessing he broke it; then he gave it to the disciples saying, "Take and eat this, it means my body."
John 6:52-57
The Jews then wrangled with one another, saying, "How can he give us his flesh to eat?"
1 Corinthians 5:6-8
Your boasting is no credit to you. Do you not know that a morsel of dough will leaven the whole lump?
Galatians 5:9
(A morsel of dough will leaven the whole lump.)
1 Thessalonians 1:6
and you started to copy us and the Lord, welcoming the word, though it brought you heavy trouble, with a joy inspired by the holy Spirit.