Mark 8:15-21 (New King James Version)

¹⁵ Then He charged them, saying, “Take heed, beware of the leaven of the Pharisees and the leaven of Herod.”
¹⁶ And they reasoned among themselves, saying, “ It is because we have no bread.”
¹⁷ 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^[a] hardened? ¹⁸ Having eyes, do you not see? And having ears, do you not hear? And do you not remember? ¹⁹ 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.”
²⁰ “Also, when I broke the seven for the four thousand, how many large baskets full of fragments did you take up?”
And they said, “Seven.”
²¹ So He said to them, “How is it you do not understand?”