By warning the disciples against the hypocrisy, or “leaven,” of the Pharisees, Jesus sought to keep His followers from an insidious influence that would undermine faith and corrupt their walk with God. Believers today should heed the same warning from the Lord and guard against pharisaic attitudes and the temptation to take pride in man-made teachings and traditions. Once a bit of pharisaism is introduced into the church, it can quickly spread.