A wicked and faithless generation is seeking a sign, but no sign shall be given it but the sign of Jonah." So he left them and went away. When his disciples reached the other side of the lake, they had forgotten to bring bread. Presently Jesus said to them, "Take heed and beware of the leaven of the Pharisees." read more.
And they began discussing it among themselves, saying, "It is because we did not bring any bread." When Jesus knew it he said: "Weaklings in faith! Why are you arguing among yourselves, because you have no bread? "Do you not remember the five loaves for the five thousand, and how many large basketfuls you took up? "Nor the seven loaves for the four thousand, and how many large basketfuls you took up? "How is it that you do not perceive that I did not speak to you concerning bread? But beware off the leaven of the Pharisees and Sadducees!" Then they realized that he had not told them to beware of the leaven, but of the teaching of the Pharisees and Sadducees.

Then he left them, and getting into the boat again, went away to the other side, Now they had forgotten to take bread, and had not in the boat with them more than one loaf. So he gave them this warning. "Look out! Be on the watch against the leaven of the Pharisees, and the leaven of Herod." read more.
And they began arguing with one another because they had no bread, He noted this and said to them. "Why are you arguing together because you have no bread? Do you not yet perceive and understand? Are your minds so slow to comprehend? You have eyes, do you not see? You have ears, do you not hear? Do you not remember? When I broke the five loaves among the five thousand, how many baskets of broken pieces did you take up?" "Twelve," they said. "And when the seven for the four thousand, how many hampers full of fragments did you pick up?" "Do you not yet understand?" he said.