Detect the Leaven of Pharisees
One of the interesting characteristics of leaven is that its fermentation process produces pockets of air that “puff up” whatever it is in. God uses this phenomenon in describing people who have allowed the leaven of hypocrisy in their lives. When Paul instructed the believers at Corinth to remove the immoral man from their assembly, he also addressed the serious problem of pride that they were exhibiting: “Ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you” (I Corinthians 5:2).
One way the Corinthians demonstrated pride was by forming factions around their favorite teachers and being puffed up against each other because of which teacher each one followed. (See I Corinthians 4:6.) Paul also warned them about the pride of living in the knowledge of liberty without showing love through deference to weaker brothers when he said, “Knowledge puffeth up, but charity edifieth” (I Corinthians 8:1).