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.
Luke 12:1
In the mean time, when the multitude was gathered together in myriads, so that they trod one upon another, he began to say to his disciples first, Beware of the leaven of the Pharisees, which is hypocrisy.
Acts 12:3
And seeing that it pleased the Jews, he proceeded to apprehend Peter also; (then were the days of unleavened bread;)
1 Corinthians 5:7-8
Cleanse out the old leaven, that ye may be a new lump, as ye are unleavened; for our passover also hath been sacrificed, even Christ.
Galatians 5:12
Would that they who unsettle you would quite cut themselves off!