“Every word of God is pure,” but the same can’t be said of all the words human beings say about God’s words (Prov. 30:5, KJV). This is one of the problems Jesus called attention to in His earthly ministry. The religious leaders of His day bound heavy burdens on their followers, got distracted by seeking recognition, shut the kingdom against God’s people, greedily profited off the offerings made to God, misrepresented the truth, and focused on minutia while ignoring weighty matters of the law. In short, they were hypocrites (Matt. 23).
In Matthew 16, Jesus told His disciples, “Take heed and beware of the leaven of the Pharisees and of the Sadducees” (Matt. 16:6, KJV). The disciples were confused at first, but after some discussion they realized He wasn’t telling them to “beware of the leaven of bread, but of the doctrine of the Pharisees and of the Sadducees” (Matt. 16:12, KJV).
How Leavening Works
The New Testament speaks of leavening representing hypocrisy, malice, and wickedness (Luke 12:1; 1 Cor 5:8). And when we consider the physical affect of a leavening agent like yeast, we see leaven as something souring, spreading, fermenting, and puffed-up.
Matthew Henry suggests that the warning “take heed and beware” in Matthew 16 is given because disciples are especially vulnerable to this type of deception. We can easily fall victim to those like the “Pharisees, who are great pretenders to devotion, and Sadducees, who pretend to a free and impartial search after the truth” (MHC on Matt. 16:5-12).
We’re not talking about a corrupting influence from outside the church. These people operate within, corrupting the doctrine that came direct from God. Read more