Short answer: Jeremiah 31:31–34 records God's promise to make a new covenant with Israel and Judah, explicitly not like the covenant he made at the exodus, which they broke. What makes it new is God's own action inside his people: he puts his law in their inward parts and writes it on their heart, and he says he will be their God and they will be his people. He also promises that all of them will know him, from least to greatest, because he will forgive their iniquity and remember their sin no more. The passage grounds the covenant in God's forgiveness rather than in Israel's performance.
A promise spoken into a broken covenant
Jeremiah 31:31–34 is a prophetic oracle, and the voice is Yahweh's, reported by the prophet and marked again and again by the messenger formula, “says Yahweh.” Its occasion is the exile. The covenant made at the exodus had been broken, and the people had every reason to think the old arrangement was finished. The shape of the unit is a deliberate contrast. A promise opens with “Behold, the days come,” then comes a negative comparison with the covenant made with the fathers, and then a positive description of the new covenant in three movements: God's law written within, a mutual knowledge of God, and forgiveness. Verses 35 and 36 anchor it all in the fixed order of sun, moon, and stars.
The immediate setting matters. This chapter is a run of restoration promises to a people who have tasted judgment, and just before the covenant promise the text takes up a proverb about fathers eating sour grapes while the children's teeth are set on edge. That saying carried a fatalistic shrug: we are suffering for our ancestors' sin. God answers it plainly. Jeremiah 31:30 says, “But everyone will die for his own iniquity. Every man who eats the sour grapes, his teeth will be set on edge.” Personal responsibility is settled first, the moral ledger cleared, before any positive promise is made.
Then the promise names both halves of the divided nation, “the house of Israel, and with the house of Judah” (31:31). The comparison is with the covenant God made when he took the people by the hand to bring them out of Egypt, the one the text says they broke, though he was a husband to them (31:32). So this is not a repair of something working. It is God's answer to a broken relationship. Verses 35 and 36 press the point further, arguing from the ordinances of sun, moon, and stars that Israel's standing before God is as secure as the created order he keeps in place.
A new covenant, written within
God announces a coming day when a familiar proverb will fall silent. People had been saying that the fathers ate sour grapes and the children's teeth were set on edge, a way of blaming one generation's failure for the next generation's pain. Jeremiah 31:30 answers it plainly: each person will answer for his own sin. Then the passage turns from that proverb to a promise. God says the days are coming when he will make a new covenant with the house of Israel and the house of Judah. The word new carries weight because the next verse defines it by contrast, not by improvement.
That contrast is specific. This covenant is not like the one God made with the fathers when he took them by the hand to lead them out of Egypt. That earlier covenant, God says, they broke, and he describes himself in the breaking as a husband to them. The failure is not a technicality but a betrayal of relationship. So the newness is not a fresh set of rules laid alongside the old. The problem was never the law's content but where it sat, outside a people who broke it. God promises to put his law in their inward parts and write it on their heart.
Notice where the promise lands. God says he will be their God and they will be his people, and he says no one will need to teach a neighbor to know him, because they will all know him, from the least to the greatest. That knowledge rests on something God himself does: he forgives their iniquity and remembers their sin no more. Knowing God and being forgiven are held together here, not separated. This is a promise of God's covenant faithfulness and mercy, not a guarantee that circumstances, health, or hardship will change. The ground of hope is who God is toward his people, and that he keeps his word.
This is a promise of God's covenant faithfulness and mercy, not a guarantee that circumstances, health, or hardship will change. The ground of hope is who God is toward his people, and that he keeps his word.
A new covenant written on the heart
Jeremiah 31 opens with restoration promises to a people who had known judgment, and before the covenant promise arrives, verses 29 and 30 clear the ground. A proverb had been circulating: fathers eat sour grapes and the children's teeth ache. It gave that generation a fatalistic excuse, as though they were only suffering for their ancestors' failures. God answers it directly, saying each person will die for his own iniquity. Personal responsibility is affirmed, not to crush them, but so the promise that follows lands on people who know their need is their own. The moral ledger is settled before anything new is offered.
Then comes the promise. God says the days are coming when he will make a new covenant with the house of Israel and the house of Judah, naming both halves of the divided nation. It will not be like the covenant made at the exodus, which the text says the people broke, though God had been a husband to them. So this is God's answer to a broken relationship, not a repair of a working one. Its newness lies in what God does inside his people: he puts his law in their inward parts and writes it on their heart, so obedience flows from an inward reality rather than an external code alone.
The covenant carries three concrete promises. God says, “I will be their God, and they shall be my people” (Jeremiah 31:33), restoring the relationship the old covenant had strained. He adds that they will all know him, from least to greatest, so no one will need to teach a neighbor to know the Lord. And he grounds it all in forgiveness: he will forgive their iniquity and remember their sin no more. Verses 35 and 36 anchor this in the fixed order of sun, moon, and stars, arguing that Israel's standing is as secure as the created order God sustains.
Where readers differ on the new covenant
Evangelical readers agree that Jeremiah 31:31–34 promises a real covenant that God himself initiates, but they differ over who fulfills it. Some read the promise as fulfilled in the church through the gospel: the law written on the heart describes the Spirit's work in believers, and the shared knowledge of God describes the church's common life. Others insist the named parties matter. The promise is made with the house of Israel and the house of Judah, and verses 35–36 tie it to the fixed order of sun, moon and stars. On that reading, the passage looks for a future restoration of national Israel. Both readings take the text seriously; they part ways over timing and identity.
The text sets some limits on the debate. It does not say the old covenant was evil, only that the people broke it, though God was a husband to them (31:32). The problem was not the covenant's wickedness but its violation, and the remedy is inward: God puts his law within them and writes it on their heart. A second dispute concerns “they will all know me” in 31:34. Does that mean every member of the covenant community without exception, or a knowledge of God so direct that no one must teach a neighbor? The verse supports the second plainly and leaves the first open to discussion. Jeremiah does not settle every question about when these things occur.
What stays central across these readings is worth naming. God speaks and acts first; the covenant is his to make, not Israel's to negotiate. He transforms his people from the inside rather than by external pressure alone. He forgives iniquity and remembers sin no more, which is the ground on which any of this rests. And he binds himself to a people, refusing to abandon those he calls his own. This is a promise of covenant faithfulness and forgiveness, not a guarantee that circumstances, health or hardship will change. Readers may still disagree about fulfillment, but they can agree on where to stand: on God's initiative, his inward work, and his mercy.
The new covenant written on the heart
Jeremiah speaks to a people who had turned a proverb into a philosophy of life: the fathers ate sour grapes, and the children's teeth are set on edge. The complaint was that God was punishing one generation for another's sin. Verses 29–30 answer it plainly. Each person will die for his own iniquity, and the one who eats the sour grapes is the one whose teeth are set on edge. The passage begins with personal responsibility, not with a fresh promise. That matters, because the covenant that follows is not a shrug at sin. It is God's answer to a guilt that people could feel but could not escape.
Then God announces something only he can do. Verses 31–32 look back to the covenant made when he took Israel by the hand out of Egypt, a covenant they broke even though he was a husband to them. The new covenant is not an improved version of that arrangement. Its distinguishing mark is placement: God will put his law in their inward parts and write it on their heart. Verse 33 says, “I will be their God, and they shall be my people.” Obedience moves from an external code to an inward, relational reality, and God himself does the writing.
Verse 34 ties the whole promise to forgiveness: they will all know God, from the least to the greatest, because he will forgive their iniquity and remember their sin no more. This is where the passage reaches Christ without being stretched. Jesus inaugurated the new covenant in his blood, and the forgiveness announced here is accomplished there. The Spirit he sends writes the law on the heart, making obedience inward rather than performative. Notice what is promised: God's covenant faithfulness and pardon, not improved circumstances, health, or relief from hardship. The guarantee is that he will be our God and will not count our sin against us.
The new covenant written on the heart
Living as people who know God
Jeremiah speaks to a people who had broken covenant, and the promise he gives begins with forgiveness rather than with a demand for better performance. Notice the order in 31:34: God says he will forgive iniquity and remember sin no more, and only then does the life of knowing him make sense. Read that over your own failures. Confession is not a way to earn the promise; it is how you agree with a God who has already said what he will do with your sin. Do not keep carrying what he has said he will not hold against you.
The promise is inward: God says he will put his law within them and write it on the heart. That is different from mere restraint, where behavior is held back by fear while desire stays unchanged. Ask him to form what you want, not only to stop what you do, and treat that change as his work rather than a project you finish by willpower. Progress may be slow and uneven. The text promises a God who keeps covenant with his people, not that your circumstances will improve or that obedience will bring ease.
The shared knowledge of God shapes life together. In 31:34 everyone knows him, from least to greatest, so teaching one another flows from a community that knows him rather than replacing that knowledge. Practically, that means talking about him in ordinary conversation, praying with the people near you, and letting forgiveness shape how you treat those who have wronged you. None of this guarantees that your situation will change. It promises something sturdier: a God who writes on hearts and remembers sin no more, and who remains faithful to his people.
Biblical fidelity check
Jeremiah 31:31–34 is read here by first noting its setting: it follows the proverb in 31:29–30 about fathers eating sour grapes, so the promise answers a complaint about inherited guilt. The word new is doing real work, since the covenant is explicitly not according to the one made at the exodus, which Israel broke. Watch the risk of flattening the named parties, the house of Israel, and with the house of Judah, into a generic audience, or of reading the inward writing as if the law's content were replaced rather than relocated.
The real disagreement is how this covenant relates to the church. Some see fulfillment now in the Spirit's work among believers; others read the named houses and the creation-order anchor of 31:35–36 as pointing to a future restoration of national Israel. The extent of they will all know me is also disputed. What stays central across readings: God initiates, he transforms inwardly, he forgives, and he keeps his people. The text never calls the old covenant evil, only broken.
Related studies for Jeremiah 31:31-34
For further study, compare this promise with Jeremiah 31:31-34: What Is the New Covenant on the covenant at Sinai, Forgiveness of Sin: What 1 John 1:9 Actually Promises on the heart and obedience, Hebrews 9:15: Jesus, Mediator of the New Covenant on how the New Testament takes up this passage, and Jeremiah 31:31-34: The New Covenant Written on Hearts on forgiveness and covenant faithfulness.
Frequently asked questions
What makes the new covenant in Jeremiah 31 different from the old covenant?
The difference is stated in the text itself: the new covenant is "not according to the covenant that I made with their fathers" (Jeremiah 31:32). That earlier covenant at the exodus was broken by the people, so its failure was not God's neglect but their unfaithfulness. The new one is different because God takes the initiative to place his law within them and write it on their heart, so that the covenant is carried inwardly rather than only on stone or scroll. The result is a settled relationship, "I will be their God, and they shall be my people" (Jeremiah 31:33), and a forgiveness that removes the sin that broke the first covenant.
Is the new covenant promise to Israel fulfilled in the church or still future?
Christians have genuinely disagreed here, and the disagreement should be named rather than smoothed over. One reading holds that the new covenant is fulfilled in Christ and his church, since the New Testament ties his blood to this covenant and gathers believing Jews and Gentiles into one people. Another reading holds that the promises to the house of Israel and the house of Judah retain a future fulfillment for national Israel, and that the church shares in the covenant's blessings without exhausting them. What stays central in both readings is that God himself establishes the covenant, writes his law on the heart, and forgives sin, and no reader is free to set that aside.
What does it mean that God will write his law on the heart?
It means God works inwardly so that his will is known and wanted from the inside, not merely imposed from outside. The parallel line in Jeremiah 31:33 says he will put his law in their inward parts, so the two phrases explain each other: the law is no longer only an external code but an inward reality. This does not make the law unimportant or turn obedience into something automatic; it describes a people whose life with God is shaped from within. The promise is about God's transforming action, not about improved circumstances or an easier life.
