An evil and false generation is searching after a sign. However, no sign will be given to it but the sign of Jonah. Then he left them. The disciples came from the other side of the sea. They did not think to obtain bread. Jesus said: Take care to have nothing to do with the leaven of the Pharisees and Sadducees. read more.
They reasoned among themselves, saying: We took no bread. Hearing this, Jesus said: You of little faith, why are you reasoning among yourselves about not having bread? Do you still not see or remember the five cakes of bread of the five thousand, and the number of baskets you took up? Or the seven cakes of bread of the four thousand, and the number of baskets you took up? Why do you not understand I was not talking about bread? Instead, about keeping away from the leaven of the Pharisees and Sadducees? Then they realized it was not the leaven of bread he had in mind. It was the teaching of the Pharisees and Sadducees.

He left them and boarded the boat and departed to the other side. They forgot to take bread and they only had one loaf with them in the boat. He ordered them to be aware of the leaven of the Pharisees and the leaven of Herod. read more.
They reasoned with one another saying: We have no bread. Hearing this Jesus said: Why do you reason about having no bread? Do you not understand? Are your hearts dull of understanding? Having eyes, do you not see? Having ears, do you not hear? And do you not remember? When I broke the five loaves among the five thousand how many baskets full of broken pieces did you up bring back? They answered: Twelve. And the seven loaves among the four thousand, how many baskets full of broken pieces did you bring back? And they told him: Seven. He said: Do you not yet understand?