Matthew 16:6Meaning & Commentary from the Church Fathers

Why did He not caution them about the doctrines? Clearly, He aimed to remind them of past events, as He understood they had lost sight of them. There was no clear need for a direct admonition; however, by using the opportunity to draw a rebuke from their own reflections, the correction became less pointed for them. Why did I not chastise them at the moment when they asked, "Where can we find bread in the wilderness?" It seemed an opportune time for such a response, yet He refrained from stating that to avoid revealing His intention to perform a miracle. Additionally, He wished to neither criticize them harshly nor to elevate Himself before the crowd.

Just as leaven can be sour and aged, so too the teachings of the Pharisees and Sadducees, which were tainted and rooted in the old traditions of the elders, caused harm to souls. Similarly, like leaven composed of water and flour, the doctrine of the Pharisees is a blend of scripture and a morally corrupt way of life. He did not explicitly instruct them to "Beware of the teaching of the Pharisees," but intended to bring to their minds the miracles performed with the loaves.

The one who avoids the influence of the Pharisees and Sadducees does not adhere strictly to the commandments and the written law, nor does he take pleasure in human traditions to uphold God's commandments.

In the Gospel of Mark (Mark 8:15), it is recorded that He cautioned them by saying, “See, guard against the leaven of the Pharisees, and against the leaven of Herod.” The repetition in His command underscores its importance, emphasizing the urgency of the warning. The term "leaven" used here signifies the teachings of the Pharisees, Sadducees, and Herodians. The Pharisees and Sadducees are referenced earlier in the text, while the Herodians appear later. By describing this doctrine as leaven, He implies that it has become corrupted and spoiled.

The Lord instructs the apostles to avoid the leaven of the Pharisees and Sadducees, cautioning them against engaging in the controversies of the Jews. The matters of the law are to be understood through the lens of faith. This admonition signifies that those living in an era when the Truth has manifested in the flesh should evaluate everything only in light of the hope for conformity to the revealed truth. They must not let the teachings of the Pharisees, who lack knowledge of Christ, weaken the power of the gospel message.

“Beware of the leaven of the Pharisees and Sadducees,” the Lord cautioned. The Sadducees exemplify indifference, while the Pharisees represent those who outwardly appear zealous. They take no action, while the latter feign activity but, in truth, accomplish nothing. We find ourselves in a similar state with those enamored by humanistic ideals. They speak incessantly about the welfare of the people, yet their rhetoric yields no benefit, as their words remain empty; they are merely pretenders. Their compassion is fabricated, an act for show, masking their true self-interest. Rhetoric demands no sacrifice—indeed, they squander it, and they retreat when genuine sacrifice is necessary.

Jesus warned them, “Take heed of the leaven of the Pharisees and the Sadducees, the influences of these two formidable groups that are so antagonistic toward Me.”

Following a confrontation with the Pharisees and Sadducees in the regions of Dalmanutha and Magdala, Christ once again traverses to the opposite side of the sea, specifically the eastern shore, to evade the animosity of His adversaries. Upon His arrival, He warns His disciples to be cautious of the leaven of the Pharisees and Sadducees (Mt. 6), of the Pharisees and Herod (Mk. 8:15), and the hypocrisy of the Pharisees (Lk. 12:1), which reflects the materialism and secularism of the Sadducees, as well as the political priorities of the Herodians. The disciples had overlooked bringing sufficient bread, as they had only one loaf available in the boat (Mk. 8:14).

As Jesus entered the boat, He felt sorrow for the hardness of heart exhibited by the Pharisees and Sadducees, who remained with the crowd on the shore. His sorrow was deepened by the realization that His chosen disciples, though loyal to Him, lacked the necessary faith. Wanting to caution them against the spiritual blindness of the Pharisees, who were unable to recognize the signs of the times, He instructed them, “Watch out for the leaven of the Pharisees and the leaven of Herod.” Since Herod Antipas was associated with the Sadducee sect, the leaven of Herod signifies the same as the leaven of the Sadducees.

"Take heed of the leaven of the Pharisees and Sadducees": this metaphor of leaven conveys both positive and negative implications; positively, it represents the profound and transformative influence of Christian teachings and their essence (Matt. 13:33); negatively, it signifies the hidden, corrupting influence of an evil initiation, doctrine, or ethical path (cf. 1 Cor. 5ff.). The erroneous and harmful teachings of the Pharisees and Sadducees, their corrupt moral guidance, their hypocritical lifestyle, and the pollution in their moral and social principles—this is the leaven that the Lord instructs His followers to be wary of (cf. Mt. 16:12, Lk. 12 and Mt. 23). "Just as leaven is tainted and old, the teachings of the Pharisees and Sadducees, which are permeated with bitterness and bring forth the ancient customs of the elders, have corrupted the hearts of those who heed them" (Theophilus).

After leaving the morally bankrupt hypocrites who could not be spiritually redeemed, Jesus Christ embarked once more in the boat, heading to the opposite shore of the Sea of Galilee. The disciples, having forgotten to bring provisions, possessed only a single loaf of bread. In this moment, Jesus cautioned them, saying, "Take heed and beware of the leaven of the Pharisees and Sadducees, and Herod's leaven," as noted by the holy evangelist Mark. He was alerting them to the toxic doctrines and superstitions of the Pharisees, the skepticism of the Sadducees, the immorality propagated by the Herodians, and the corrupt way of life embraced by all. These were the deceptive influences he urged his sincere disciples to avoid.