Why did God promise a new covenant when the covenant at Sinai came from Him? His Law was good, but Israel broke it. The people needed forgiveness and an inward change that commands alone could not produce. The New Covenant answers that need. Through Christ’s blood, God provides forgiveness and new life that we could never obtain by trying harder to obey.
God Promised a New Covenant
Jeremiah announced the New Covenant while Judah was rebelling and judgment was approaching. The people still possessed the written Law, and priests still offered sacrifices at the temple. Those privileges had not kept them faithful to the LORD. Israel and Judah had broken the covenant made when God brought their fathers out of Egypt, and Jerusalem faced judgment.
A covenant is a binding pledge or arrangement; the Hebrew word is בְּרִית (berith). God establishes the relationship, giving His promises and setting out what He requires of His people. Jeremiah calls the coming covenant new, using חָדָשׁ (chadash), and contrasts it with the covenant the people had broken. God promises more than a small repair to the existing order.
“Behold, the days are coming, says the LORD, when I will make a new covenant with the house of Israel and with the house of Judah–
not according to the covenant that I made with their fathers in the day that I took them by the hand to lead them out of the land of Egypt, My covenant which they broke, though I was a husband to them, says the LORD.
But this is the covenant that I will make with the house of Israel after those days, says the LORD: I will put My law in their minds, and write it on their hearts; and I will be their God, and they shall be My people.
No more shall every man teach his neighbor, and every man his brother, saying, ‘Know the LORD,’ for they all shall know Me, from the least of them to the greatest of them, says the LORD. For I will forgive their iniquity, and their sin I will remember no more.”
God names Israel and Judah, identifies the broken covenant as the one made at the exodus, and promises to write His law within His people. They will know Him, belong to Him, and receive forgiveness. The New Covenant does not abandon holiness. It supplies the inward work and restored fellowship sinful people need.
I keep returning to His promise, “For I will forgive their iniquity, and their sin I will remember no more.” A long religious history could not remove Israel’s guilt. Neither can familiarity with Scripture or participation in worship remove mine. We need God to forgive actual wrongdoing and renew the heart from which it comes.
The Law was holy, righteous, and good. It governed Israel’s national life, made God’s requirements known, and exposed the people’s transgressions. Its inability to justify sinners was not a defect in God’s righteousness.
Therefore by the deeds of the law no flesh will be justified in His sight, for by the law is the knowledge of sin.
To be justified is to be declared righteous before God. Obeying a command now cannot erase our guilt for the ones we have already broken. The Law also provided sacrifices, but those offerings had to be repeated. Paul explains their limitation in Hebrews.
For the law, having a shadow of the good things to come, and not the very image of the things, can never with these same sacrifices, which they offer continually year by year, make those who approach perfect.
God appointed those sacrifices to teach Israel about sin and uncleanness, and about the need for a life to be given for sinners. Yet even when offered year after year, animal sacrifices could not obtain eternal redemption. Christ would provide the sacrifice they anticipated. Jeremiah’s promise therefore fulfills God’s saving purpose without dishonoring the instruction He gave at Sinai. A Complete Bible Study on the Mosaic Covenant examines that earlier covenant more fully.
The New Covenant Changes the Heart
Ezekiel describes the inward renewal Jeremiah announced. God will cleanse His people from their filthiness and idols, replace their heart of stone, and put His Spirit within them.
Then I will sprinkle clean water on you, and you shall be clean; I will cleanse you from all your filthiness and from all your idols.
I will give you a new heart and put a new spirit within you; I will take the heart of stone out of your flesh and give you a heart of flesh.
I will put My Spirit within you and cause you to walk in My statutes, and you will keep My judgments and do them.
A heart of stone cannot give itself spiritual life. God promises to give His people a new heart and place His Spirit within them. The obedience He produces grows out of that new life. We do not pay for forgiveness by obeying, but genuine renewal changes our willingness to listen to God and do what He says.
Paul points to the Corinthian believers as evidence of this work. Their changed lives were a letter of Christ, written by the Spirit rather than with ink.
Clearly you are an epistle of Christ, ministered by us, written not with ink but by the Spirit of the living God, not on tablets of stone but on tablets of flesh, that is, of the heart.
He is describing the Spirit’s work in people, not disparaging God’s written instruction. Commands inscribed on stone could expose sin and pronounce judgment, but they could not give the inward life the Spirit provides. God does not merely give sinners a better religious appearance. He makes those who receive Christ new from within.
When I speak of regeneration, I mean genuine new birth. Calling myself a Christian cannot accomplish it, and a religious label is not evidence that it has happened. The Spirit’s work should become evident in a changed response to God and in how we treat other people. We must not turn that evidence into the means of earning the new life it displays.
Jesus Established the Covenant in His Blood
On the night before His crucifixion, Jesus connected His approaching death with the covenant God had promised. After supper, He took the cup and told His disciples what His shed blood would accomplish.
Likewise He also took the cup after supper, saying, “This cup is the new covenant in My blood, which is shed for you.”
Matthew records the purpose for which His blood would be shed.
For this is My blood of the new covenant, which is shed for many for the remission of sins.
Remission means forgiveness. The words “for the remission of sins” explain why He would give His life. The eternal Son of God had become fully man without ceasing to be fully God. Conceived by the Holy Spirit and born of the virgin Mary, He lived without sin and willingly offered His own life as the perfect sacrifice for us.
Wicked men betrayed and mocked Him, then beat and scourged Him before crucifying and killing Him. He physically bore the punishment for our sins in His innocent body as He shed His blood and died. The Father did not punish, curse, abandon, strike, bruise, or pour wrath on Jesus. Father, Son, and Holy Spirit acted in unity to redeem us. His saving sacrifice was complete at His death. He was then buried and rose bodily on the third day.
Blood had marked the covenant ceremony at Sinai, where Moses called the sacrificial blood “the blood of the covenant” (Exodus 24:8). Sin had to be dealt with for the people to have fellowship with a holy God. Jesus established the New Covenant through His own blood. Animal sacrifices could not provide that complete redemption.
Not with the blood of goats and calves, but with His own blood He entered the Most Holy Place once for all, having obtained eternal redemption.
Christ entered heaven having already obtained eternal redemption through His death. His priestly presence in heaven does not complete an unfinished sacrifice or require another death. The Lord’s Supper remembers His offering without repeating it. No church ritual can finish His sacrifice, and our suffering cannot add merit to it. His blood is sufficient because of who He is and the perfection of what He gave. A Complete Bible Study on the Blood of Christ for Salvation considers that sufficiency further.
Christ died for the sins of the whole world, so God’s offer of salvation is genuine for every person. People can resist His grace and reject Him. Everyone who repents and believes in Jesus receives forgiveness and new birth. We receive His saving work by faith; we cannot make ourselves acceptable to God by resolving to improve.
That if you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead, you will be saved.
For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation.
For “whoever calls on the name of the LORD shall be saved.”
Jesus Is the Mediator of the Better Covenant
In Hebrews, Paul quotes Jeremiah 31 at length and explains the better ministry by which Jesus fulfills that promise. Jesus is both the High Priest who represents His people and the Mediator through whom they approach God.
But now He has obtained a more excellent ministry, inasmuch as He is also Mediator of a better covenant, which was established on better promises.
As Mediator, Jesus stands between God and us. He represents us as One who is fully human, yet He is also God the Son, whose person and work have divine worth. He brings us to God on the basis of His own completed sacrifice, rather than through the blood of another. His ministry secures the eternal inheritance God has promised.
And for this reason He is the Mediator of the new covenant, by means of death, for the redemption of the transgressions under the first covenant, that those who are called may receive the promise of the eternal inheritance.
Those who trusted God under the first covenant also depended on Christ’s death for redemption. Animal offerings did not earn their eternal forgiveness. Christ accomplished what those sacrifices could not, so the living Son is the Savior they needed as well as the One we need.
The Greek word diatheke, translated covenant, can also mean a testament or will. Hebrews 9:16-17 draws on that meaning when explaining death and inheritance: a testament takes effect upon the death of the person who made it. Christ’s death secured the covenant’s promised blessing. We receive that grace freely because He gave His life, and the One who died now lives forever as our Mediator.
The priests who served under the former covenant died and had to be replaced. Jesus lives forever, so His priesthood never passes to another. We approach God through His living Son on the strength of His completed sacrifice, without bringing another offering to keep the covenant in force.
Gentile Believers Share the Blessing Without Replacing Israel
God’s promise still names Israel and Judah. I do not accept an explanation that removes the future He pledged to the very people Jeremiah named. Their reunion, forgiveness, and knowledge of the LORD belong to the hope He gave them.
The apostles also apply New Covenant blessings to believers in Christ now. His blood brings Gentiles near to God, and faith joins them to the Messiah. They need not become ethnic Israel or place themselves under the Mosaic Law to receive His salvation. Paul uses the picture of an olive tree to explain their inclusion.
And if some of the branches were broken off, and you, being a wild olive tree, were grafted in among them, and with them became a partaker of the root and fatness of the olive tree,
do not boast against the branches.
Gentiles share the richness of God’s saving promise through faith and mercy. Paul therefore forbids boasting against the natural branches. Israel’s hardening is partial, and God is able to graft the natural branches in again. Receiving mercy from Israel’s Messiah gives us reason for gratitude toward God, not contempt for Israel.
The church’s participation in these blessings is real. Gentile believers receive full forgiveness and the indwelling Spirit because they belong to Christ; they are not second-class recipients of His grace. That does not rewrite Jeremiah or cancel God’s future work with Israel and Judah. Israel will know the covenant promise in its fullness when the nation turns to the Messiah.
This inclusion of the nations was no late change in God’s purpose. The Noahic Covenant preserved the world in which redemption would unfold. Abraham received the promise of blessing for all nations through his Seed. The Mosaic Covenant revealed God’s holiness and the need for sacrifice, while David received the promise of an enduring royal house. Jesus fulfills these promises as the Seed through whom the nations are blessed and the sacrifice that deals with sin. He is also the Mediator who brings us to God and the risen Son of David whose kingdom will endure.
For all the promises of God in Him are Yes, and in Him Amen, to the glory of God through us.
Grace Produces Obedience and Future Hope
The church remembers the covenant’s foundation whenever believers share the Lord’s Supper. Jesus commanded remembrance, and Paul explains that the bread and cup proclaim His death until He comes.
In the same manner He also took the cup after supper, saying, “This cup is the new covenant in My blood. This do, as often as you drink it, in remembrance of Me.”
For as often as you eat this bread and drink this cup, you proclaim the Lord’s death till He comes.
Communion directs us back to Christ’s once-for-all death and forward to His return. The meal does not become another sacrifice for sin or save someone apart from repentance and faith. We take part in obedience to Him, with gratitude for the Savior whose blood established our fellowship with God. A Complete Bible Study on Communion examines the observance further.
I would not assign the cup exactly the same covenant role as circumcision under Abraham or the Sabbath under Moses. The New Testament tells us to remember Christ and proclaim His death. We should understand the cup through that instruction, rather than assume that each covenant’s outward observances must function identically.
The grace proclaimed at the Table also governs the way believers live. We are not under the Mosaic Covenant as Israel’s national law, yet the God who forgives us writes His truth on the heart and gives His Spirit to produce obedience.
For sin shall not have dominion over you, for you are not under law but under grace.
Someone genuinely born again is forgiven, indwelt by the Spirit, and sealed in Christ. That believer is eternally secure because salvation rests on Christ’s blood and promise. Our performance neither purchases that salvation nor keeps it in force. This assurance gives no permission for lawlessness. Simply saying we are Christians does not establish that we have been made new. Genuine faith becomes evident as we turn from sin, love others, endure difficulties, and grow in our willingness to obey. Believers still stumble and need correction; new birth does not mean we have reached sinless perfection.
I can confess sin honestly because my hope rests in the Savior rather than in a claim to have made myself righteous. If I have lied, treated someone cruelly, or excused conduct Scripture condemns, belonging to Christ gives me reason to admit the wrong and turn from it. His grace does not require me to defend my sin to protect a religious reputation. The Spirit renews believers and teaches them to pursue holiness. A Complete Bible Study on Soteriology: The Study of Salvation considers this saving work more fully.
The covenant is established, and everyone who repents and believes receives its saving blessings now. We await the bodily return of our living Mediator, who will raise His people and bring us into the kingdom’s promised fullness. Our hope reaches beyond this present life.
Therefore, since we are receiving a kingdom which cannot be shaken, let us have grace, by which we may serve God acceptably with reverence and godly fear.
Paul joins confidence in an unshakable kingdom with reverent service to God. The words “till He comes” at the Lord’s Table direct us toward that future. We proclaim the death of One who rose bodily and will return. Because our inheritance is secure, we can serve Him with gratitude and take His commands seriously while we wait.
My Final Thoughts
The New Covenant directs me to what Christ has accomplished and to the new life He gives. God’s Law exposed our sin; the Savior shed His blood to obtain our forgiveness and bring us to God through His completed sacrifice. His grace gives genuine believers security and a reason to obey from the heart. I do not have to prove myself worthy before I can come to Him. I can confess the sin He exposes, receive His correction, and obey because I belong to Him. At His Table, I remember the death that secured this mercy and proclaim it while waiting for our living Mediator to return.