Mark 8:16-19

And they reasoned among themselves, saying, “It is because we have no bread.” But Jesus, being aware of it, said to them, “Why do you reason because you have no bread? Do you not yet perceive nor understand? Is your heart still hardened? Having eyes, do you not see? And having ears, do you not hear? And do you not remember? When I broke the five loaves for the five thousand, how many baskets full of fragments did you take up?” They said to Him, “Twelve.”