Mark 8:15-19

And he charged them, saying, Take heed, beware of the leaven of the Pharisees, and of the leaven of Herod.

And they reasoned among themselves, saying, It is because we have no bread.

And when Jesus knew it, he saith unto them, Why reason ye, because ye have no bread? perceive ye not yet, neither understand? have ye your heart yet hardened?

Having eyes, see ye not? and having ears, hear ye not? and do ye not remember?

When I brake the five loaves among five thousand, how many baskets full of fragments took ye up? They say unto him, Twelve.