11 How is it you don't understand that I was not talking to you about bread? But be on your guard against the yeast of the Pharisees and Sadducees." 12 Then they understood that he was not telling them to guard against the yeast used in bread, but against the teaching of the Pharisees and Sadducees.
11 How is it that you fail to understand that I did not speak about bread? Beware of the leaven of the Pharisees and Sadducees." 12 Then they understood that he did not tell them to beware of the leaven of bread, but of the teaching of the Pharisees and Sadducees.
11 Haven't you realized yet that bread isn't the problem? The problem is yeast, Pharisee-Sadducee yeast." 12 Then they got it: that he wasn't concerned about eating, but teaching - the Pharisee-Sadducee kind of teaching.
11 How is it you do not understand that I did not speak to you concerning bread?--but to beware of the leaven of the Pharisees and Sadducees." 12 Then they understood that He did not tell them to beware of the leaven of bread, but of the doctrine of the Pharisees and Sadducees.
11 Why can't you understand that I'm not talking about bread? So again I say, 'Beware of the yeast of the Pharisees and Sadducees.'" 12 Then at last they understood that he wasn't speaking about the yeast in bread, but about the deceptive teaching of the Pharisees and Sadducees.
Matthew Henry's Commentary on Matthew 16:11-12
Commentary on Matthew 16:5-12
(Read Matthew 16:5-12)
Christ speaks of spiritual things under a similitude, and the disciples misunderstand him of carnal things. He took it ill that they should think him as thoughtful about bread as they were; that they should be so little acquainted with his way of preaching. Then understood they what he meant. Christ teaches by the Spirit of wisdom in the heart, opening the understanding to the Spirit of revelation in the word.