Christ the Fulfillment of the Law
Understanding Matthew 5:17 Through the Lens of the New Covenant

Matthew 5:17 is one of those verses that can create tension if we do not slow down and really understand what Jesus is saying. In the middle of the Sermon on the Mount, Jesus says, “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them.” The Gospel of Matthew. For many people, this raises an immediate question: if Jesus did not abolish the Law, are believers still supposed to live under the Mosaic Covenant? Should Christians still observe Old Testament feasts, dietary laws, ceremonial regulations, and the sacrificial system? Others go to the opposite extreme and act as though the Law has no value whatsoever. Yet Jesus does not allow either conclusion. He does not reject the Law, but He also does not leave it standing untouched. Instead, Jesus fulfills it completely.

To understand Matthew 5:17 correctly, we have to understand both the purpose of the Law and the assignment of Jesus. The Law was never the final destination. The Law was preparing the way for Someone. It was setting the table for the Messiah. Every sacrifice, every priest, every command, every prophecy, and every aspect of the covenant was ultimately pointing forward to Christ. Jesus did not come to oppose the Law. He came standing on the shoulders of it. He came as the fulfillment of everything it anticipated. The Law was given through Moses, but grace and truth came through Jesus Christ.

The Mosaic Covenant was given to a specific people, for a specific purpose, and for a specific time period. First, it was given to Israel. God established the covenant with the Jewish people through Moses. This covenant shaped Israel’s identity and separated them from the surrounding nations. The moral laws, ceremonial laws, civil laws, sacrificial system, dietary regulations, and temple worship all functioned together to establish Israel as a people set apart unto God. The covenant was not given universally to all nations; it was given specifically to Israel as part of God’s redemptive plan in history.

Second, the Law had a specific purpose. God used the Law to preserve Israel and prepare the world for the coming Messiah. The Law revealed the holiness of God and exposed the sinfulness of humanity. It established sacrifices because sin required atonement. It established priests because humanity needed a mediator. It established worship because humanity was created for communion with God. The Law was not just a set of random religious regulations. It was prophetic in nature. It was preparing the stage for Jesus' arrival.

Paul later describes the Law as a guardian leading people to Christ. (Galatians 3:24)The Law showed humanity its inability to save itself. The commandments were holy, but humanity was broken. The problem was never the Law itself. The problem was the weakness of sinful humanity. The Law could command righteousness, but it could not produce righteousness in fallen people. It could expose sin, but it could not transform the heart.

Third, the Mosaic Covenant was for a specific time. This is important because many people treat the Old Covenant as though it were intended to function eternally. Yet Jesus Himself says the Law remains until its purpose is achieved. The Law had an intended fulfillment. Covenants have terms, purposes, and conditions.. Once its purpose was fulfilled, the covenant itself would transition into something greater.

A helpful way to understand this is through the picture of a mortgage contract. When someone signs a mortgage, they enter into a legally binding agreement with specific terms, obligations, and a defined purpose. The contract remains active until its requirements are fully satisfied. No one continues making payments on a fulfilled mortgage because the obligation connected to that contract has already been satisfied.

In many ways, the transition from the Old Covenant to the New Covenant works in a similar way. The Mosaic Covenant was holy, purposeful, and established by God, yet it always moved toward fulfillment in Christ. When Jesus fulfilled the Law, He satisfied its demands completely and brought the covenant to its intended completion. That does not mean there are no similarities between the covenants. Many of the moral truths revealed under the Law continue under the New Covenant because they reflect the character and holiness of God; they are moral absolutes. Yet believers are no longer bound to the Mosaic Covenant as a covenantal system because Christ has already fulfilled it. The New Covenant is not merely an amendment to the old agreement; it is a new and better covenant established through the finished work of Jesus Christ.

This is why the word “fulfill” in Matthew 5:17 is so significant. Jesus says He did not come to abolish the Law but to fulfill it. Fulfillment does not mean opposition. Jesus was not attacking the Law as though it was bad or unnecessary. The Law was good because it came from God. Instead, fulfillment means bringing something to its intended completion. Jesus accomplished what the Law pointed toward but could never ultimately produce.

The sacrificial system pointed toward Christ. Under the Old Covenant, sacrifices had to be repeated continually because they could never permanently remove sin. Day after day priests offered sacrifices again and again. Yet all of those sacrifices were shadows pointing toward the Lamb of God who would take away the sin of the world. Jesus fulfilled the sacrificial system through His death on the cross. His sacrifice was not temporary or repetitive. It was once for all.

Jesus also fulfilled the Law morally. Where every other person failed, Jesus obeyed perfectly. He fulfilled every righteous requirement of the Law completely. Yet interestingly, Jesus did not lower the standard of holiness. He raised it. In the Sermon on the Mount, Jesus explains that righteousness is not merely external behavior management. Anger reveals the roots of murder. Lust reveals the roots of adultery. Jesus exposed the reality that sin begins internally before it ever manifests externally. The Law was never simply about outward compliance; it was about the condition of the heart.

This is why grace is so necessary. The Law demands righteousness, but grace empowers transformation. Humanity could never fulfill the righteous standard of God through effort alone. Jesus fulfilled righteousness on behalf of humanity and then offers His righteousness to those who believe. The gospel is not that humanity finally became good enough for God. The gospel is that Jesus did what humanity could never do.

The book of Hebrews explains this transition from the Old Covenant to the New Covenant with incredible clarity. Hebrews declares that Jesus is the mediator of a “better covenant” established upon “better promises”(Hebrews 8:6). The writer of Hebrews quotes Jeremiah’s prophecy about a coming New Covenant and then makes a bold statement: by calling the covenant “new,” God made the first covenant obsolete. This does not mean the Old Covenant was evil or meaningless. It means its purpose had been fulfilled in Christ.

The writer of Hebrews goes on to explain that under the Old Covenant, priests stood daily offering sacrifices that could never fully remove sin. But Jesus offered Himself once for all time and then sat down at the right hand of God.(Ebrews 12:10). Jesus sat down because the work was finished. The Law could expose sin, but it could not conquer it. Jesus did what the Law could not do. Through His death and resurrection, He provided complete forgiveness and reconciliation with God.

Paul reinforces this truth in Romans 10:4 when he writes, “Christ is the end of the law so that there may be righteousness for everyone who believes.” Christ is the fulfillment of the Law. Righteousness is now found through faith in Christ rather than through adherence to the Mosaic Covenant. This does not mean morality disappears. Rather, holiness is now empowered through a relationship with Christ and the work of the Holy Spirit.

One of the most beautiful implications of the New Covenant is forgiveness. Under the Law, sacrifices continually reminded people of sin. Under grace, believers are reminded of Jesus’ sufficiency. Hebrews 8:12 says, “For I will forgive their wickedness and will remember their sins no more.” That is staggering. God does not merely tolerate forgiven people; He removes their sin completely through Christ. Shame no longer has the final word because the cross has already spoken.

The New Covenant also brings intimacy with God. The Old Covenant was rooted primarily in external instruction, but the New Covenant is rooted in the internal work relationship. Jesus told His disciples, “I no longer call you servants... Instead, I have called you friends.”(John 15:15) Through Christ, believers are invited into fellowship with God Himself. Christianity is not merely about rule-keeping; it is about communion with the Father through the Son by the Holy Spirit.

This covenant also establishes believers within the family of God. Galatians 4 explains that Christ came under the Law to redeem those under the Law so that believers could receive adoption as sons and daughters. The kingdom of God is not simply a labor force; it is a family. In religion, people often think they must behave to belong. Yet the gospel reverses that order. In Christ, believers belong first, and transformation flows from relationship rather than performance.

This does not mean grace gives permission for sin. Jesus did not eliminate holiness. He intensified it. But the difference is that transformation now flows from a changed heart rather than external pressure. The Law could modify behavior temporarily, but only grace can radically transform the inner person. This is why Paul says believers are saved by grace through faith, not by works, yet they are also created for good works. Grace does not destroy obedience; grace empowers it.

Ultimately, Matthew 5:17 reveals the beauty of Jesus as the fulfillment of God’s redemptive plan. Jesus did not come to tear down the Law or dismiss it as irrelevant. He came to accomplish everything it pointed toward. The Law prepared the way for Him. The sacrifices pointed toward Him. The prophets testified about Him. The priesthood anticipated Him. The temple foreshadowed Him. In Christ, the Old Covenant reaches its fulfillment and completion.

Because of Jesus, believers now stand under a better covenant built on better promises. They are forgiven completely, welcomed into fellowship with God, adopted into His family, and empowered by grace to walk in holiness. The hope of the gospel is not found in human performance but in the finished work of Christ. Jesus fulfilled the Law completely so that through Him, humanity might finally be reconciled to God.

WORKS CITED
The Holy Bible, New International Version. Grand Rapids, MI: Zondervan, 1984.