When the disciples reached the other side of the lake, they forgot to bring bread.
Jesus said to them, "Beware of the leaven of the Pharisees and the Sadducees."
Hear the words of Jesus, his followers began to say to another, "He said so because we did not bring bread."
Jesus knew what they were saying. So he said, "Why are you discussing about do not have bread? You less trust!
Still do not understand you? Do you not remember the five loaves that I split apart for five thousand people? How much extra bread basket that you collect?
And how also with seven loaves for four thousand people? How many baskets of extra food that you collect?
How did you guys do not understand that I'm not talking to you about bread? Beware of the leaven of the Pharisees and Sadducees! "
Finally, the disciples understood that Jesus told them to be careful not of leaven used to make bread, but be careful of teachings the Pharisees and the Sadducees.