An evil and false generation is searching after a sign; and no sign will be given to it but the sign of Jonah. And he went away from them. And when the disciples came to the other side they had not taken thought to get bread. And Jesus said to them, Take care to have nothing to do with the leaven of the Pharisees and Sadducees. read more.
And they were reasoning among themselves, saying, We took no bread. And Jesus, seeing it, said, O you of little faith, why are you reasoning among yourselves, because you have no bread? Do you still not see, or keep in mind 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? How is it that you do not see that I was not talking to you about bread, but about keeping away from the leaven of the Pharisees and Sadducees? Then they saw that it was not the leaven of bread which he had in mind, but the teaching of the Pharisees and Sadducees.

And he went away from them, and again got into the boat and went across to the other side. And they had taken no thought to get bread; and they had only one cake of bread with them in the boat. And he said to them, Take care to be on the watch against the leaven of the Pharisees and the leaven of Herod. read more.
And they said to one another, We have no bread. And Jesus, hearing it, said to them, Why are you reasoning among yourselves because you have no bread? do you still not see, and is it still not clear to you? are your hearts so hard? Having eyes, do you not see? and having ears, have you no hearing? and have you no memory? When I made a division of the five cakes of bread among the five thousand, what number of baskets full of broken bits did you take up? They said to him, Twelve. And when the seven among the four thousand, what number of baskets full of broken bits did you take up? And they said to him, Seven. And he said to them, Is it still not clear to you?