A wicked and adulterous generation asks for a sign, but no sign will be given to it except the sign of Jonah." Then he left them and went away. When the disciples went to the other side, they forgot to take bread. "Watch out," Jesus said to them, "beware of the yeast of the Pharisees and Sadducees." read more.
So they began to discuss this among themselves, saying, "It is because we brought no bread." When Jesus learned of this, he said, "You who have such little faith! Why are you arguing among yourselves about having no bread? Do you still not understand? Don't you remember the five loaves for the five thousand, and how many baskets you took up? Or the seven loaves for the four thousand and how many baskets you took up? How could you not understand that I was not speaking to you about bread? But beware of the yeast of the Pharisees and Sadducees!" Then they understood that he had not told them to be on guard against the yeast in bread, but against the teaching of the Pharisees and Sadducees.

Then he left them, got back into the boat, and went to the other side. Now they had forgotten to take bread, except for one loaf they had with them in the boat. And Jesus ordered them, "Watch out! Beware of the yeast of the Pharisees and the yeast of Herod!" read more.
So they began to discuss with one another about having no bread. When he learned of this, Jesus said to them, "Why are you arguing about having no bread? Do you still not see or understand? Have your hearts been hardened? Though you have eyes, don't you see? And though you have ears, can't you hear? Don't you remember? When I broke the five loaves for the five thousand, how many baskets full of pieces did you pick up?" They replied, "Twelve." "When I broke the seven loaves for the four thousand, how many baskets full of pieces did you pick up?" They replied, "Seven." Then he said to them, "Do you still not understand?"