Many thousands of people came together. There were so many people that they were stepping on each other. Before Jesus spoke to the people, he said to his followers, “Be careful of the yeast of the Pharisees. I mean that they are hypocrites.
Then the followers understood what Jesus meant. He was not telling them to guard against the yeast used in bread. He was telling them to guard against the teaching of the Pharisees and the Sadducees.
Many Pharisees and Sadducees came to where John was baptizing people. When John saw them, he said, “You are all snakes! Who warned you to run from God’s judgment that is coming?
So how could you think that I am concerned about bread? I am telling you to be careful and guard against the yeast of the Pharisees and the Sadducees.”