The Sermon on the Mount · Matthew 5:17-20

I Am Not Come to Destroy, but to Fulfil

Matthew 5 to 7 · Jesus’ greatest sermon, the manifesto of the kingdom

Jesus says He did not come to abolish the law and the prophets but to fulfill them. He honors every command of God down to the smallest stroke, and then raises the standard beyond anything the religious experts imagined, insisting that a righteousness which only manages outward rules cannot enter the kingdom. This is not a lowering of God's law but a deepening of it, and it drives every honest hearer to look for a righteousness they cannot produce on their own.

Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven. For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.Matthew 5:17-20 (KJV)

What Jesus said

Some in the crowd may have wondered whether this new teacher was setting aside the Scriptures of Israel. Jesus answers directly: think not that I am come to destroy the law, or the prophets; I am not come to destroy, but to fulfil. Not one jot or tittle, the smallest letter and the tiniest pen stroke, will pass away until all is accomplished.

Then He raises the bar. The righteousness that gets a person into the kingdom must exceed the righteousness of the scribes and Pharisees, the most careful, rule-keeping people anyone knew. This sets up everything that follows in the sermon, where Jesus takes command after command and presses each one from the outward act down to the desires of the heart.

What it meant then, and what it means now

The scribes and Pharisees were not villains in the popular eye; they were admired as the gold standard of devotion. To say that ordinary people needed a righteousness beyond theirs was to close the door on self-improvement as a way in. If the experts fell short, no amount of trying harder would be enough.

Today the same word confronts two errors at once. It refuses the idea that grace makes God's commands irrelevant, for Jesus upholds the law to its last letter. And it refuses the idea that we can be right with God by our moral record, for the standard is higher than our best. The law still shows us what love looks like, and it still shows us how far we fall short of it.

How it goes to the heart

To fulfill the law is more than to obey its rules; it is to bring out its full meaning. The command against murder was always about more than avoiding a killing; it protected the sacredness of a brother's life. Jesus is not adding new burdens for their own sake; He is revealing what the commandments meant all along, which was never mere external compliance but a heart aligned with God.

This is why the sermon keeps moving inward. A righteousness that exceeds the Pharisees is not one with more rules but one with a different center, a heart that loves what God loves. That kind of righteousness cannot be faked and cannot be self-generated, which is exactly the point Jesus is leading us to feel.

How it has been misapplied, and rightly applied

Some have used this passage to bind Christians to the whole Mosaic code, including its ceremonies and civil penalties, missing that Jesus says He fulfills the law, bringing it to its goal in Himself. Others have swung the other way, treating the law as abolished and grace as a license to live however they please, which flatly contradicts His words that not a jot will pass away.

Rightly applied, the passage holds two truths together. God's moral will is permanent and good, and we are meant to take it more seriously, not less. Yet the law was never a ladder to climb into God's favor. It is a mirror that shows us our need and a signpost that points to the One who kept it perfectly on our behalf.

A closer look at the words

When Jesus speaks of a jot and a tittle, He points to the smallest marks in the Scriptures. The jot is the yod, the tiniest letter of the Hebrew alphabet, and the tittle is the little stroke that distinguishes one letter from another. By naming them, Jesus affirms that not even the smallest detail of God’s Word is discarded. He holds the Scriptures in the highest honor.

The key word is fulfil. It means more than to obey; it means to fill full, to bring a thing to the purpose it was always heading toward. The law and the prophets were pointing forward, and Jesus is the point they were pointing to. He does not cancel them, He completes them, the way a promise is completed when it comes true.

His demand for a righteousness that exceeds the scribes and Pharisees is not a call for more of the same. Theirs was a righteousness of careful outward performance; His is a righteousness of the heart. The difference is not quantity but kind, not stricter rule-keeping but a transformed inner life that the rest of the sermon will describe.

Living this today

This passage steers between two ditches that still catch believers. On one side is legalism, which treats the Christian life as a checklist of rules and quietly makes rule-keeping the ground of our standing with God. On the other is a careless grace that treats God’s commands as optional now that we are forgiven. Jesus closes both roads at once, honoring the law fully while lifting its standard beyond our reach.

The healthy response is to let God’s commands do their double work. As a mirror, the law shows us how far we fall short and drives us to Christ for mercy. As a map, it shows us the shape of love, the way of life that pleases God, once we belong to Him. Neither use is possible if we soften the law or ignore it.

Practically, take the commands of God more seriously, not less, but never as a ladder to climb into His favor. Read them as the description of a life you are being remade to live, and let every place you fall short send you back to the grace of the One who kept them all in your place.

How it points to Christ

Jesus is the only person who ever fulfilled the law and the prophets completely. He obeyed every command from the heart, and He fulfilled every promise the prophets made, becoming Himself the goal toward which all of Scripture pointed. When He demands a righteousness greater than the Pharisees', He is describing His own.

This is the good news hidden inside the high standard. The righteousness we cannot achieve, He achieved, and by faith He gives it to us as a gift, counting His obedience as ours. So the sermon that seems to shut every door of self-effort opens the one door that matters. We enter the kingdom not by matching Christ's righteousness but by receiving it.

A note for every tradition: the Sermon on the Mount is honored across the whole church as the heart of Jesus’ teaching. This is faithful, mainstream exposition, holding the hard sayings with both honesty and grace. Above all it points to Christ, who alone lived this sermon perfectly and gives grace to all who follow Him.

Continue in the sermon: Salt and light · Anger and reconciliation · The gospel · The whole Sermon on the Mount