Jesus warned His disciples: 'Take heed, beware of the leaven of the Pharisees, and of the leaven of Herod' Mk 8:15. What does Jesus' mean by the leaven of Herod? The leaven of Herod is conjoined to and contrasted with the leaven of the Pharisees (which is hypocrisy Lk 12:1, a rigorous religious legalism, which …