So let's keep celebrating the festival, neither with old yeast nor with yeast that is evil and wicked, but with yeast-free bread that is both sincere and true.

How can you fail to understand that I wasn't talking to you about bread? Beware of the yeast of the Pharisees and Sadducees!"

Then they understood that he did not say to beware of the yeast used in bread, but of the teaching of the Pharisees and Sadducees.