Jesus takes takes his disciples to a Gentile region known as Caesarea Phillipi. It is alto the shrine of the god Pan. He asks them "Who they say the Son of Man is? Then he turns to them and asks :Who do you say I am."
Jesus reprimands the disciples for thinking the leaven that he mentions with the Pharisees and Sadducees is because they didn't bring any bread. They miss the point that a small amount of evil can corrupt a whole group.