Mark 8:13-17

And he left them, and entering into the ship again departed to the other side.

Now the disciples had forgotten to take bread, neither had they in the ship with them more than one loaf.

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?