The Sermon on the Mount stands as one of Scripture’s most profound teachings. Found in Matthew chapters 5 through 7, this message delivered on a hillside contains some of Jesus’ most challenging and transformative words. For those of us seeking to live out our faith in everyday life, whether in the workplace, the locker room, or the boardroom, these teachings demand our careful attention and humble reflection.
Yet let’s be honest: understanding Jesus’ message isn’t always straightforward. His wisdom operates on a different level than our own, challenging our assumptions and calling us to something greater. In this article, we’ll explore one of the most crucial passages in the Sermon on the Mount: Jesus’ teaching about how He fulfills the Law and His radical call to righteousness found in Matthew 5:17, 20.
Understanding what Jesus meant in these verses can transform how we approach Scripture, righteousness, and our relationship with God.
What Is the Law
Before we can understand Jesus’ claims about fulfillment, we need clarity on terminology. When Jesus speaks of “the Law, He isn’t referring to government statutes or civic codes. Instead, He’s addressing the foundational teachings of the Hebrew Scriptures.
In Jesus’ day, Jewish people referred to what we call the Old Testament as “the Law and the Prophets.” This wasn’t two separate categories but a way of describing the entirety of Scripture available to them. The Law specifically referred to the five books of Moses, Genesis, Exodus, Leviticus, Numbers, and Deuteronomy, collectively known as the Pentateuch. The Prophets encompassed the remaining Old Testament writings, from Joshua through Malachi.
These weren’t merely historical documents or moral suggestions. They represented God’s revealed will for His people, containing commands, covenants, prophecies, and patterns that shaped Jewish identity and practice. When Jesus speaks of fulfilling the Law and the Prophets, He’s making a claim about the entirety of Old Testament Scripture.
Jesus as the Fulfillment of the Law
Here’s where Jesus makes His most striking assertion. In Matthew 5:17, He declares: “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.
This statement cuts against potential misunderstandings. Some might have thought Jesus came to discard the Old Testament or reject God’s earlier revelation. Others might have believed He came to add his own layer of teaching on top. But Jesus makes clear that His mission was neither abolition nor addition.,it was completion.
Think of it this way: if the Law and Prophets were a portrait being painted, Jesus came not to destroy the canvas but to finish the masterpiece in a way that finally makes complete sense.
Four Dimensions of Fulfillment
Jesus accomplished this fulfillment in multiple ways. First, He fulfilled the doctrinal content of the Old Testament by revealing its full meaning and significance. The teachings that seemed puzzling or incomplete suddenly find their coherent center in Christ.
Second, Jesus fulfilled the messianic prophecies scattered throughout Scripture. Every prediction about God’s anointed one—His birth, His suffering, His kingship, found its reality in His person and work.
Third, He fulfilled the moral and legal demands of God’s Law by living in perfect obedience in a way no other human has ever achieved. He didn’t break a single command; He embodied God’s righteous standard completely. In doing so, He also reinterpreted the Law, exposing how leaders of His time had twisted it into something harsh and oppressive, revealing instead its true spirit and intention.
Fourth, and perhaps most crucial for our salvation, Jesus fulfilled the penalty for sin. The Law shows us what sin is and demands justice. Through His death on the cross, Jesus bore the punishment that we deserved, satisfying God’s justice and opening the door to grace.
The Apostle Paul reinforced this truth centuries later when he wrote, Christ is the end of the law so that there may be righteousness for everyone who believes” (Romans 10:4). Jesus isn’t merely one teacher among many; He’s the culmination of everything God had been working toward.
The Authority of God’s Word
Jesus didn’t stop at claiming He’d fulfilled the Law. He went further to establish the absolute authority and permanence of God’s Word.
In Matthew 5:18, Jesus continues: For truly I tell you, until heaven and earth disappear, not the smallest letter, not the least stroke of the pen, will by any means disappear from the Law until everything is accomplished.
The specificity here is intentional. When Jesus speaks of the smallest letter, He’s referring to the minutest details of Hebrew script, characters so small they could easily be overlooked. The stroke of the pen” refers to the tiniest distinguishing mark that differentiates one letter from another. In other words, nothing, not even the most microscopic detail, will pass away unfulfilled.
This has profound implications. God’s Word isn’t subject to our preferences or cultural evolution. It won’t be outdated or superseded. It stands with absolute authority until all things are brought to completion at the end of history.
For us as followers of Christ, this means we can trust Scripture. We can stake our lives on it. The God who spoke these words into being stands behind every single one of them. When we read the Bible, we’re not encountering mere human wisdom or historical artifacts, we’re encountering the authoritative Word of the eternal God.
The Least of These Commands
Having established the permanence and authority of Scripture, Jesus makes another surprising statement in Matthew 5:19: Therefore anyone who sets aside one of the least of these commands and teaches others accordingly will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven.
Notice that Jesus doesn’t distinguish between major and minor commands in terms of importance. He won’t allow us to rank God’s instructions as if some matter and others don’t. This is humbling, even confrontational.
The book of James echoes this principle: For whoever keeps the whole law yet stumbles at just one point is guilty of breaking all of it” (James 2:10). In God’s sight, the violation of one command reveals a fundamental problem, a failure to align with God’s character and authority.
But there’s a paradox here worth wrestling with. Jesus seems to suggest we should practice and teach all God’s commands without dismissing any. Yet He also knows something crucial: it’s impossible for sinful humans to perfectly obey every command. This apparent contradiction actually points us toward grace.
The Law serves as a mirror, showing us our need for God. It’s not meant to be a ladder we climb to earn God’s favor, but rather a schoolmaster leading us to recognize our dependence on Christ. When we truly understand the impossibility of perfect obedience, we stop relying on our own righteousness and turn instead to Jesus’ righteousness, which is offered freely to all who believe.
Righteousness That Surpasses the Pharisees
Perhaps Jesus’ most radical claim comes in Matthew 5:20: For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven.
To Jesus’ original audience, this statement seemed absurd. The Pharisees were the gold standard of religious observance. They didn’t merely follow the Law, they meticulously interpreted and applied it, creating additional safeguards to prevent accidental violation. Matthew 23:23 shows us how far they went, noting that they tithed even their spices, ensuring perfect compliance in every area.
If anyone had achieved righteousness through rule-keeping, it was the Pharisees. Yet Jesus says our righteousness must exceed theirs.
Internal Versus External Righteousness
The problem, Jesus reveals, isn’t that the Pharisees were too strict but that they fundamentally misunderstood righteousness. They had perfected external compliance while missing the transformation of the heart. Jesus cares about who we are becoming, not just what we’re doing.
You can obey rules while harboring pride, anger, greed, or judgment inside. You can present an unblemished external record while your interior is cluttered with sin. This is what Jesus was addressing when He later called certain religious leaders “whitewashed tombs, beautiful on the outside but containing death within (Matthew 23:27).
True righteousness, Jesus teaches, flows from a transformed heart. It begins not with behavior modification but with spiritual rebirth, with an inward reorientation toward God and His values.
Righteousness Through Christ Alone
So how do we achieve this surpassing righteousness? Not through greater effort or stricter discipline. The answer is breathtakingly simple and profoundly liberating: we receive it as a gift through faith in Christ.
Paul explains it this way: God made him who had no sin to be sin for us, so that in him we might become the righteousness of God” (2 Corinthians 5:21). Our righteousness isn’t generated from within ourselves; it’s imparted to us through the life, death, and resurrection of Jesus. When God looks at those who trust in Christ, He doesn’t see our failures and shortcomings. He sees Christ’s perfect record credited to our account.
This is the heart of the gospel. We’re justified not by our performance but by our faith, and that faith opens the door to progressive sanctification, the gradual transformation of our character as the Holy Spirit shapes us from the inside out.
Frequently Asked Questions
What does “Fulfillment of the Law” mean in the Sermon on the Mount
Jesus teaches that He came not to abolish the Law, but to complete its true purpose through obedience from the heart.
Where is the Fulfillment of the Law found in the Bible
It is primarily found in Matthew 5:17,20, within the Sermon on the Mount.
How did Jesus fulfill the Law and the Prophets
He fulfilled them through His teachings, perfect obedience, and ultimate sacrifice.
What is the main message of Matthew 5:17
The main message is that God’s Law remains meaningful, and Jesus brings its full meaning to light.
Why is the Fulfillment of the Law important for Christians
It shows believers that righteousness is deeper than outward actions; it is about inner transformation.
What does Jesus say about righteousness in this passage
He says our righteousness must exceed that of the Pharisees to enter the kingdom of heaven.
Does the Fulfillment of the Law cancel Old Testament commands
No, Jesus clarifies that the Law is not cancelled, but understood and lived more fully through Him.
How should Christians obey the Law according to Jesus
Christians are called to follow the spirit of the Law, loving God and others sincerely.
What examples does Jesus use after teaching about the Law
He discusses anger, lust, divorce, oaths, retaliation, and love for enemies.
How can I apply the Fulfillment of the Law in daily life
Live with sincere love, integrity, forgiveness, and obedience to God from the heart.
Conclusion
Jesus’ teaching on the fulfillment of the Law addresses something every believer struggles with: the gap between God’s righteous standard and our capacity to meet it. He meets us in that gap with grace.
The Law and Prophets retain their authority. They reveal God’s character and expose our needs. But they also point us forward, directing our gaze away from our own efforts and toward the One who perfectly obeyed in our place. Jesus didn’t come to invalidate Scripture or lower God’s standards. He came to fulfill what we cannot, to bridge the distance between a holy God and sinful humanity.
As you move through your week, whether competing on the field, making decisions in the boardroom, or leading in your community, remember that your righteousness doesn’t come from perfect performance. It comes from union with Christ. The Law humbles you; the cross transforms you. And that transforming work, begun at your conversion, continues as the Spirit conforms you increasingly to the image of Christ.
That’s the promise hidden within Jesus’ most challenging sermon.
Samuel Reed is a devoted Christian writer with 4 years of experience sharing Bible verses, blessings, and prayers on Beginingrace.com. His writings reflect faith, hope, and the peaceful message of God’s grace for every heart