Matthew 16:12
Then they understood, that he did not bid them beware of the leaven of the Pharisees and Sadducees, but of the teaching of the Pharisees and Sadducees.
Matthew 26:26
And, as they were eating, Jesus took a loaf, and having blessed, broke it, and gave it to the disciples, and said, Take, eat; this is my body.
John 6:52-57
The Jews therefore contended with one another, saying, How can this man give us his flesh to eat?
1 Corinthians 5:6-8
Your glorying is not good. Know ye not, that a little leaven leaveneth the whole lump?
Galatians 5:9
A little leaven leaveneth the whole lump.
1 Thessalonians 1:6
And ye became imitators of us and of the Lord, having received the word in much affliction with joy from the Holy Spirit;