'Yeast Of The Pharisees' in the Bible

And Jesus said to them, "Look out, and be on your guard against the yeast of the Pharisees and Sadducees!"

Why do you not see that I was not talking to you about bread? But be on your guard against the yeast of the Pharisees and Sadducees!"

And he warned them, saying, "Look out! Be on your guard against the yeast of the Pharisees and the yeast of Herod!"

Meanwhile as the people gathered in thousands, until they actually trod on one another, he proceeded to say to his disciples first of all, "Beware of the yeast of the Pharisees, that is, hypocrisy.