The Pharisees then ask him for a sign, but he refuses and warns them against the leaven (influence) of the Pharisees and the leaven of Herod. Jesus then asks his apostles who people say that he is, and they tell him that some say he is John the Baptist, others say he is Elijah, and still others say he is one of the prophets. Jesus asks the apostles who they think he is, and Peter responds that he is the Messiah. Jesus then begins to teach them about his coming death and resurrection.