How is it that you do not understand that I spoke not to you concerning bread, that you should beware of the leaven of the Pharisees and of the Sadducees?
Read Chapter 16
John Chrysostom
AD 407
And to teach you how great the power of His reproof, and how it roused up their slumbering mind, hear what says the evangelist. For Jesus having said no more, but having reproved them.