Matthew 16:12

12 aThen they understood that he did not tell them to beware of the leaven of bread, but of bthe teaching of the Pharisees and Sadducees.

Luke 12:1

Beware of the Leaven of the Pharisees

1In the meantime, cwhen so many thousands of the people had gathered together that they were trampling one another, he began to say to his disciples first, dBeware of ethe leaven of the Pharisees, fwhich is hypocrisy.
Copyright information for ESV