Mark 8:16

He left them, and again entering into the boat, departed to the other side.

They forgot to take bread; and they didn’t have more than one loaf in the boat with them.

He warned them, saying, “Take heed: beware of the yeast of the Pharisees and the yeast of Herod.”

Jesus, perceiving it, said to them, “Why do you reason that it’s because you have no bread? Don’t you perceive yet or understand? Is your heart still hardened?

Having eyes, don’t you see? Having ears, don’t you hear? Don’t you remember?

When I broke the five loaves among the five thousand, how many baskets full of broken pieces did you take up?”

They told him, “Twelve.”