Matt 15:1–20 — Defilement Comes From Within

The emphasis of this passage is upon the heart. Jesus quotes Isaiah: “This people honors me with their lips, but their heart is far from me” (Matt. 15:8). He later explains, “What comes out of the mouth proceeds from the heart, and this defiles a person” (v. 18). Out of the heart come evil thoughts and the sins he lists. Defilement comes from within.

The Tradition of the Elders

The Pharisees condemn Jesus and his disciples because they do not keep an oral tradition handed down from the Jewish elders. The Pharisees taught that the ritual holiness required of priests under the Mosaic law should be observed by all the people. They were zealous for holiness, but their concern was not holiness of heart. It was ritual purity: avoiding the things that could make a person ceremonially unclean.

Leviticus identifies various sources of uncleanness, such as contact with a dead body or eating unclean food. The Pharisees followed a rabbinic tradition that they believed went back orally to Moses and defined purity and impurity in even greater detail than the written law. One of those traditions required washing one’s hands before eating.

The original purity laws served a particular purpose within Israel’s covenant life, especially in connection with worship and the priesthood. The Pharisaic program extended that priestly standard throughout the population and surrounded it with increasingly detailed interpretations. Their zeal appeared impressive, but it concentrated upon remaining ritually uncontaminated rather than upon loving God with a pure heart.

This was not a matter of hygiene or protection from disease. It was a ritual act intended to prevent defilement. The disciples of Jesus deliberately did not follow it. They ate publicly with unwashed hands because, as followers of Jesus, they had learned that the tradition of the elders did not possess divine authority.

The Pharisees have appeared many times before this point in Matthew. They conspired to destroy Jesus after he healed on the Sabbath, and they accused him of casting out demons by the prince of demons. Here, however, Pharisees and scribes come from Jerusalem. Word has reached the center of religious authority, and its leaders are displeased. They send representatives to confront Jesus: “Why do your disciples break the tradition of the elders?”

That journey from Jerusalem is significant. Local Pharisees were present in Galilee, but these men represent the highest religious authorities at the center of Jewish life. The dispute is no longer a merely local controversy. The leadership has heard of Jesus’ teaching and the conduct of his disciples, and it now intervenes directly.

Their wording assumes the very point in dispute. God’s law can be broken, but they speak of “breaking” a human tradition as though it carried the same authority. They do not present the hand-washing practice as a question of wisdom or a possible application of the law. They assume that their tradition is God’s law and that violating one is equivalent to violating the other.

Jesus steps forward to defend his disciples. He turns the accusation back upon their accusers: “Why do you break the commandment of God for the sake of your tradition?” He stands as the champion of his people against those who would condemn them, much as Paul would later defend Gentile believers from those who insisted that they must be circumcised and keep the Mosaic law in order to be saved.

The disciples themselves offer no defense. Jesus places himself between them and their accusers, exposes the false standard being used against them, and demonstrates the true nature of obedience. This is a beautiful aspect of the scene: those who belong to Christ have a defender who is not intimidated by the moral authority claimed by their opponents.

Paul would later take a similar stand when teachers from Jerusalem attempted to place the yoke of the Mosaic law upon Gentile Christians. In Acts 15, Galatians, and elsewhere, he defends the sheep of Christ against legalistic condemnation. Both Jesus here and Paul later show that those who claim to defend righteousness may themselves be obscuring the gospel and violating God’s Word.

Jesus’ answer exposes two spiritual problems. First, the Pharisees are hypocrites: they claim to defend God’s law while breaking it for the sake of their tradition. Second, they are externalists: they focus on outward behavior and ritual purity while overlooking the heart.

Hypocrisy: Making Void the Word of God

Jesus begins with the fifth commandment: “Honor your father and your mother.” He also cites the law’s severe sanction: “Whoever reviles father or mother must surely die.” God’s command is clear and solemn.

The second quotation does not come from the wording of the Ten Commandments themselves but from a later law expounding the seriousness of the fifth commandment. Jesus places the divine command and its grave sanction side by side. The tradition he is about to describe does not concern some minor technicality; it undermines an obligation God treats with the utmost seriousness.

In a society without Social Security or a comparable system for supporting the elderly, honoring one’s parents included caring for them in old age. That obligation could be a substantial financial burden. The Pharisees had devised a way to avoid it through what Mark’s parallel account calls qorban. The word referred to something dedicated to God.

A person could point to money or property and declare it qorban. The rabbis treated that declaration as a binding vow from which the person could not be released. The property would then be unavailable to support his parents because it had supposedly been dedicated to God. Yet the son could continue using it until the later time when he would actually give it. A religious formula thus enabled him to keep his resources from the parents he was commanded to honor.

The hypocrisy is especially striking because the arrangement sounds religious. The son can portray himself as unusually devoted to God while withholding help from his parents. A vow that appears to honor God becomes the mechanism for dishonoring the father and mother God commanded him to support.

This is the legalistic maneuvering Jesus condemns. The Pharisees present themselves as guardians of righteousness, yet their tradition creates a loophole around God’s command. “For the sake of your tradition,” Jesus says, “you have made void the word of God” (v. 6).

Tradition is not inherently evil. Traditions often arise because Scripture does not address every circumstance in explicit detail, and believers must exercise wisdom in applying God’s Word. The danger comes when a human application changes from a useful supplement into a substitute for Scripture.

We therefore should not respond by imagining that every inherited practice is automatically corrupt. Churches and families need customary ways of ordering life, and many traditions embody genuine wisdom. The decisive questions are whether we distinguish those customs from God’s commands and whether we remain willing to reform them when they contradict or obscure Scripture.

This has occurred in the history of the church. A practice may begin because it seems sensible and harmless. Over time, however, it can harden into a rigid rule invested with divine authority, treated as equal to or even more important than the Word of God. Those in positions of authority may enforce it with particular zeal.

The history of the Roman Catholic Church provides examples of traditions that gradually became invested with authority on par with Scripture. Yet the spiritual danger is not safely confined to one communion or period of history. Whenever human rules become tests of righteousness and grounds for condemning others, the pattern of the Pharisees reappears.

Such a tradition can become a “righteousness engine.” Human beings want to regard themselves as righteous, even apart from any concern for God’s law. They construct rules about what may be done or said, then use those rules to establish their moral standing and condemn others. Meanwhile, they may violate the clear teaching of Scripture without hesitation.

The same impulse appears in secular culture. People who give little thought to God still desire moral vindication. They develop exacting codes, prohibited words, and approved positions that allow them to stand on the side of righteousness and denounce those who fail the test. The particular rules may change, but the engine is the same: self-justification through standards we believe we can keep.

That is why Jesus calls the Pharisees hypocrites. Their traditions make them appear righteous in the sight of others, but their hearts are far from God. They honor him with their lips while using religion to evade obedience.

Externalism: The Heart Left Untouched

The second problem accompanies the first. The Pharisees care about outward purity while leaving the heart untouched. Jesus applies Isaiah’s words to them:

This people honors me with their lips, but their heart is far from me; in vain do they worship me, teaching as doctrines the commandments of men.

Jesus then calls the people to himself and says, “Hear and understand: it is not what goes into the mouth that defiles a person, but what comes out of the mouth; this defiles a person” (vv. 10–11).

Externalism lowers the standard of righteousness to something we imagine we can accomplish. If sin is caused by an external object or practice, we can simply avoid that thing, perform the prescribed ritual, and conclude that we have solved our problem. Wash the hands, observe the process, and everything appears to be in order.

This approach is attractive because it gives visible boundaries and measurable success. We can identify the forbidden item, abstain from it, and compare our conduct favorably with that of others. A heart turned away from God is harder to measure and impossible to repair through a ritual. Externalism therefore lets us preserve the appearance of purity without confronting our need for inward renewal.

But if sin comes from the heart, it is far more powerful than the Pharisees admit. It cannot be overcome merely by conformity to outward rules and traditions. Phariseeism promises that if we keep a code, avoid certain foods or activities, and perform the required observances, we will be pure and acceptable to God. Jesus says that we could do all those things and still be defiled by our own hearts.

Defilement comes from our sinful thoughts and desires. Long before sin appears in outward action, it is present within. The human heart itself is unclean.

The Law Reaches the Heart

When Peter asks for an explanation, Jesus says:

What comes out of the mouth proceeds from the heart, and this defiles a person. For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false witness, slander.

This list alludes to the second table of the Ten Commandments, which concerns our duties toward our neighbor. Jesus has already mentioned the fifth commandment, “Honor your father and your mother.” Murder corresponds to the sixth commandment; adultery and sexual immorality to the seventh; theft to the eighth; and false witness and slander to the ninth.

All these violations arise from the heart, as the tenth commandment makes clear: “You shall not covet.” Jesus’ phrase “evil thoughts” brings the sinful desire beneath outward transgression into view. The tenth commandment shows us how all the preceding commands reach inward. We may refrain from murder while harboring hatred, or avoid physical adultery while committing adultery in the heart. Jesus made the same point in the Sermon on the Mount.

If we read only the first nine commandments superficially, we might reduce them to outward conduct: do not make an idol, do not misuse God’s name, do not kill, and do not steal. The tenth commandment prevents that reduction. Coveting is an inward desire. Once the law addresses desire, we see that the same inward dimension belongs to every command. Sin has already taken root before it appears in the hands, the body, or the mouth.

The passage therefore ends its diagnosis on a deeply condemning note. The problem is not merely that we sometimes fail to observe the right outward code. Sin comes from our own hearts.

Christ Came to Cleanse His People

This bad news prepares us for the good news. Jesus did not come to replace the Pharisees’ external rules with a better list of rules. He did not come merely to exhort us to greater purity and morality. He came to save us.

Matthew announced his mission at the beginning of the Gospel: “You shall call his name Jesus, for he will save his people from their sins” (Matt. 1:21). Jesus came to obey God’s law from the heart in a way that we never could. He came to bear our guilt at the cross, free us from the power of sin, remove hearts of stone, and give hearts of flesh renewed by the Holy Spirit.

He is not merely a more successful teacher of morality or a stricter reformer of religious practice. He is the Savior. He fulfills the obedience we owe, accepts the judgment our defilement deserves, and communicates new life. The depth of the diagnosis displays the necessity and glory of his mission.

That gospel message is not stated explicitly in Matthew 15:1–20, but it surrounds the passage in the wider narrative. Jesus’ teaching about defilement appears amid his miracles of healing and cleansing. In Matthew 8, a leper says, “Lord, if you will, you can make me clean,” and Jesus answers, “I will; be clean.” In Matthew 9, a woman rendered ritually unclean by a flow of blood touches the fringe of his garment and is healed.

These healings are enacted pictures of salvation. The leper cannot cleanse himself and the woman cannot stop the condition that excludes her. They come to Jesus in their impurity, and holiness flows from him to them. He is not contaminated by their uncleanness; instead, his cleansing power makes them whole.

Matthew 14 has just foreshadowed Christ’s death through the martyrdom of John the Baptist. It also showed Jesus feeding the multitude with bread from heaven, a sign of himself given for his people. Immediately before this passage, the sick at Gennesaret touch the fringe of Jesus’ garment and are made well. Immediately afterward, a Canaanite woman comes to Jesus crying, “Have mercy on me, O Lord, Son of David,” seeking deliverance for her daughter.

Jesus is the Messiah who cleanses and renews his people. He can do so because of his obedience unto death and his resurrection.

Purified Hearts Through Faith

How, then, do we receive purified hearts? First, we must recognize that we are sinners in a much deeper way than the Pharisees taught. Even if we exercise great self-discipline and avoid obvious transgressions, sinful desires remain within us, often hidden from everyone else.

This recognition is not an end in itself, as though Christian spirituality consisted in endlessly searching the heart and cataloging its corruption. It strips away false confidence and reveals why we need Christ. Until we understand that the problem lies within, external codes will continue to appear sufficient.

If sin were merely a matter of external behavior and ritual purity, we would not need Christ. We could attend the school of the Pharisees, learn the code, and follow it. Jesus teaches the depth of sin precisely because he has come as the Messiah to save us from our true problem: the defilement of our hearts.

Second, we receive new hearts only by going to Christ in faith. The Canaanite woman in the following passage models that response. Though a Gentile regarded as unclean, she comes to Jesus for mercy and his healing, renewing power.

At the Jerusalem Council, Peter would later defend Gentile believers against those who demanded circumcision and obedience to the whole Mosaic law. He testifies that God gave the Gentiles the Holy Spirit just as he had given him to Jewish believers, making no distinction between them and “cleansing their hearts by faith” (Acts 15:9).

The setting makes Peter’s words especially powerful. The dispute concerns people regarded as unclean outsiders and the claim that they must adopt the whole Jewish ceremonial order to become acceptable. Peter points not to ritual conformity but to God’s own testimony: the gift of the Holy Spirit. God knows the heart, and he has cleansed these Gentile hearts through faith in Christ.

That phrase is decisive. We cannot cleanse our hearts through introspection, as though we could discover every sin and scrape it away. We receive cleansing by faith—that is, by coming to Christ and trusting him.

The Promise of a New Heart

The sinfulness of the heart and God’s promise to renew it form an important theme throughout Scripture. Deuteronomy makes clear that God never intended Israel’s obedience to be merely external.

The Shema begins, “Hear, O Israel: The Lord our God, the Lord is one,” and continues, “You shall love the Lord your God with all your heart and with all your soul and with all your might” (Deut. 6:4–5). Moses later asks what the Lord requires of Israel: to fear him, walk in his ways, love him, serve him with all their heart and soul, and keep his commandments (Deut. 10:12–13).

The commandments were not simply a list of outward requirements to check off while the heart remained distant from God. God wanted the hearts of his people. He called them to love and serve him with the whole person.

This shows that Jesus is not setting aside the true intention of the Old Testament and replacing it with a new religion of inwardness. Moses himself proclaimed that God required the heart. Jesus opposes the Pharisees precisely because their externalism misses what the law had always demanded.

Moses also knew that Israel would fail. He predicted that the people would turn away and their hearts would become corrupt. Yet he promised that after exile, when they cried out for mercy, God would act: “The Lord your God will circumcise your heart and the heart of your offspring, so that you will love the Lord your God with all your heart and with all your soul, that you may live” (Deut. 30:6).

This promise anticipates the new covenant. Jeremiah 31 says, “I will put my law within them, and I will write it on their hearts.” God himself will purify the heart, write his law within, and enable his people to love him.

The progression is crucial. God commands Israel to love him from the heart, exposes the corruption that prevents such love, and then promises to perform the inward work his people cannot accomplish. The new covenant does not merely repeat the command with greater urgency. It brings divine renewal.

The promise is fulfilled in Christ. He is the true Israel, the one who loved his Father with all his heart and obeyed God’s commandments from the heart. Colossians 2:11 says that in Christ believers have been circumcised with a circumcision made without hands, through “the circumcision of Christ.” Christ was cut off at the cross, receiving the judgment deserved by our impure hearts, and then he was raised to new life.

By union with Christ, we share in his death and resurrection. We are joined to the one whose heart is wholly devoted to God, and from him we receive the promised new heart. This cleansing does not originate in us or in our efforts to make ourselves better.

Christ’s being “cut off” at the cross answers the judgment due to our uncircumcised and impure hearts. His resurrection opens the life of the new creation. United to him, believers possess both the forgiveness secured by his death and the renewing life manifested in his resurrection.

Paul therefore says, “We are the circumcision, who worship by the Spirit of God and glory in Christ Jesus” (Phil. 3:3). We boast not in ourselves but in Christ and his perfect righteousness. In him, God regards us as his renewed people. Through the Spirit of the risen Christ dwelling within us, he also progressively transforms our hearts so that we love and serve the Lord from within.

Defilement does not come from outside us; it comes from within. That is why we need the Savior God has given. Jesus obeyed from the heart, bore our judgment at the cross, rose to new life, and gives purified hearts to all who come to him by faith.