'Be On Your Guard Against The Yeast' 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 when He admonished them, "See to it, be on your guard against the yeast of the Pharisees and the yeast of Herod,"

In these circumstances, a crowd of many thousands came together, so that they were trampling on one another. He began to say to His disciples first: “Be on your guard against the yeast of the Pharisees, which is hypocrisy.