'Leaven of the Pharisees' in the Bible

And Jesus said to them; See and beware of the leaven of the Pharisees and Sadducees.

How do you not understand that I did not speak to you concerning bread, to beware of the leaven of the Pharisees and the Sadducees.

And He commanded them, saying, See, beware of the leaven of the Pharisees, and of the leaven of Herod.

In the meantime, myriads of the multitude having gathered together, So that they trode on one another, He began to speak to His disciples first; Take heed unto yourselves from the leaven of the Pharisees, which is hypocrisy.