The Yeast of the Pharisees and Herod

14 The disciples had forgotten to bring bread, except for one loaf they had with them in the boat.
References for Mark 8:14
      15 “Be careful,” Jesus warned them. “Watch out for the yeast of the Pharisees and that of Herod.”
      References for Mark 8:15
      16 They discussed this with one another and said, “It is because we have no bread.”
      17 Aware of their discussion, Jesus asked them: “Why are you talking about having no bread? Do you still not see or understand? Are your hearts hardened?
      References for Mark 8:17
      18 Do you have eyes but fail to see, and ears but fail to hear? And don’t you remember?
      19 When I broke the five loaves for the five thousand, how many basketfuls of pieces did you pick up?”“Twelve,” they replied.
      References for Mark 8:19
      20 “And when I broke the seven loaves for the four thousand, how many basketfuls of pieces did you pick up?”They answered, “Seven.”
      References for Mark 8:20
      21 He said to them, “Do you still not understand?”
      References for Mark 8:21