Beware of the leaven of the Pharisees — That is, of their false doctrine: this is elegantly so called; for it spreads in the soul, or the Church, as leaven does in meal. Luke 12:1.
Related Commentaries of Matthew 16:6
Matthew 16:6
6 Then Jesus said unto them,Take heed and beware of the leaven of the Pharisees and of the Sadducees.