Matthew 16:6, 11-12

Jesus said to them, “Be careful! Beware of the yeast of the Pharisees and the Sadducees.”

I was not talking to you about bread. Why don’t you understand that? I am telling you to beware of the yeast of the Pharisees and the Sadducees.” Then the followers understood that Jesus was not telling them to beware of the yeast used in bread but to beware of the teaching of the Pharisees and the Sadducees.