Concept

New Covenant

Intro

"What did Jesus mean when He lifted the cup at the Last Supper and called it the 'new covenant in My blood'?"

He was reaching back six hundred years to a promise from the prophet Jeremiah, and forward to His own death the next day.

In Jeremiah 31, God promises a new kind of arrangement with His people, different from the one He made with Israel at Mount Sinai through Moses. "Behold, days are coming, declares the LORD, when I will make a new covenant... not like the covenant which I made with their fathers... I will put My law within them and on their heart I will write it... they will all know Me, from the least of them to the greatest... I will forgive their wrongdoing, and their sin I will no longer remember" (Jeremiah 31:31-34).

Four features stand out in that promise.

It is internal, not external. The Old Covenant put the law on stone tablets. The New Covenant writes it on the heart. Obedience flows from a transformed inner life, not from an outer code being enforced.

It is universal among God's people. Under the Old Covenant, the priesthood mediated knowledge of God for the people. Under the New Covenant, every member of God's people knows Him directly.

Forgiveness is final. The Old Covenant sacrifices were repeated year after year on the Day of Atonement. The New Covenant brings a forgiveness God will not call back. "Their sin I will no longer remember."

It is sharply distinct from Sinai. Jeremiah says it explicitly: "not like the covenant which I made with their fathers."

When Jesus took the cup at the Last Supper and said, "This cup which is poured out for you is the new covenant in My blood" (Luke 22:20), He was claiming that the moment Jeremiah had foreseen had arrived. His death the next day would ratify the new arrangement. The blood of the new covenant would not be the blood of bulls and goats. It would be His own.

The book of Hebrews works this out in detail. Jesus is the mediator of a better covenant (Hebrews 8). His sacrifice does what the Old Covenant sacrifices could not do (Hebrews 9-10). He intercedes for His people as the eternal High Priest, in the order of Melchizedek, not Aaron (Hebrews 7).

For Christians, the practical results show up at every layer of the faith. The Spirit indwells believers, writing the law on the heart (Romans 8:9-11). Every believer has direct access to God through Christ, not through a human priest (Hebrews 4:16). Forgiveness is once for all, secured by the cross (Hebrews 10:10). The Lord's Supper, repeated in Christian worship, remembers the new covenant inauguration in Christ's blood.

For the contrast with the Old Covenant, see that page. For the full case on whether believers remain under the Mosaic law, see ris3n's paper Are Christians Still Under the Law.

See this page's graph and discover linked topics

In full

The covenantal framework promised in Jeremiah 31.29-34 and inaugurated by Jesus' blood at the Last Supper (Luke 22.19-20: "this cup which is poured out for you is the new covenant in My blood"). Where the Sinai covenant was a blood-sealed bond mediated through Moses and maintained by Levitical sacrifice, the New Covenant is sealed in Christ's own blood, internalizes the law in the believer's heart, secures complete forgiveness ("I will remember their sin no more"), and rests on the eternal high-priestly mediation of Christ in the order of Melchizedek.

Core features (per Jer 31:31-34)

Internal, not external, "I will put My law within them and on their heart I will write it." Obedience flows from inward transformation rather than from external code.
Universal among the people of God, "they will all know Me, from the least of them to the greatest." No mediating priest-class required for the basic knowledge of God.
Definitive forgiveness, "I will forgive their wrongdoing, and their sin I will no longer remember." Not the repeated-and-symbolic forgiveness of the Day of Atonement cycle, but a final settlement.
Distinct from Sinai, explicitly framed as "not like the covenant which I made with their fathers."

Inauguration

Last Supper, Jesus identifies the cup as "the new covenant in My blood" (Luke 22:20; cf. 1 Cor 11:25), echoing Moses' covenant-blood at Sinai (Exod 24:6-8) and rerouting it through Himself.
Crucifixion, the actual blood-shedding that ratifies the covenant.
Resurrection and exaltation, installs Christ as the New Covenant high priest forever (Heb 7:24-25).

Made with whom? The two houses

Jeremiah names the parties precisely: "I will make a new covenant with the house of Israel, and with the house of Judah" (Jeremiah 31:31, KJV; "house" H1004 twice, measured), and Hebrews 8:8 quotes the line unchanged. The two houses are the divided kingdom after Solomon: Israel, the northern tribes, carried off by Assyria, and Judah in the south, exiled to Babylon. Jeremiah's promise reaches past the division to the whole people. Ezekiel dramatizes the same hope with two sticks, "For Judah" and "For Joseph, the stick of Ephraim", joined into one: "they shall be no more two nations, neither shall they be divided into two kingdoms any more at all" and "one king shall be king to them all" (Ezekiel 37:16-22, KJV; see Ezekiel 37:15-28).

This raises a fair question: if the covenant is made with Israel and Judah, how do Gentile believers share in it? The New Testament's answer is through Christ, the covenant's mediator, not by becoming Israel's lost tribes:

Gentiles were "aliens from the commonwealth of Israel, and strangers from the covenants of promise", and Christ "hath made both one" so that they are "fellowcitizens with the saints" (Ephesians 2:12, 14, 19, KJV).
They are grafted, as wild olive branches, into Israel's own tree (Romans 11:17-24).
"If ye be Christ's, then are ye Abraham's seed, and heirs according to the promise" (Galatians 3:29, KJV).

The covenant is promised to Israel and Judah, established in Christ's blood (Luke 22:20), and extended to Gentiles by union with Christ. See Israel and the Church for the relationship between the two, and Jeremiah 31 New Covenant Objection Defeater for the Jewish objection that the promise has not yet been fulfilled.

The Two-House reading. Some Hebrew Roots teachers (the "Two-House" or "Ephraimite" view), and in a different form some Hebrew Israelite camps, hold that the "house of Israel" means the scattered northern tribes, now hidden among the nations, and that Gentile believers, or particular peoples, are in fact those lost Israelites. The strongest text for it is Romans 9:24-26, where Paul applies Hosea's words about the northern kingdom, "I will call them my people, which were not my people" (Hosea 1:10; 2:23), to believers. The reply is in the same sentence: Paul says God has called "not of the Jews only, but also of the Gentiles" (Romans 9:24, KJV). He applies Hosea's pattern of God re-calling a rejected people to Gentiles as Gentiles; he does not say they are Ephraim. Peter does the same for his readers (1 Peter 2:10). And Ephesians 2 describes Gentile believers as having been strangers to Israel's covenants, which they could not be if they were Israel all along. The joining of the two sticks is fulfilled under one king, Christ, not by reassigning ancestry.

Relation to the Old Covenant

Heb 8:13, the new makes the first "obsolete." The dominant New Testament framing is supersession: the Old Covenant is not run in parallel with the New, it is replaced as the governing covenantal system.
Heb 7:11-12, the change of priesthood (Levitical → Melchizedekian) entails a change of law. The two covenants cannot coexist as parallel governing structures.
Gal 3:24-25, pedagogical relation: the Law was a tutor leading to Christ; once Christ comes the tutor's role is completed.

Tensions across Christian traditions

How sharply the Old Covenant is "replaced" varies considerably:

Reformed covenantal, distinguishes one covenant of grace administered differently across redemptive history; the New Covenant is its consummate administration. Moral law (Decalogue) carries forward; ceremonial / civil are abrogated. The "obsolete" of Heb 8:13 applies to the administrative form, not to the unity of God's saving covenant.
Dispensational / supersessionist (the position of Are Christians Still Under the Law), sharp break: the Old Covenant is replaced wholesale as a governing system.
New Covenant Theology (a third option), affirms a clean break with the Mosaic Law as a covenant code while holding that Christ's law (re-stated, not derived from Sinai) governs Christian ethics.
Hebrew Roots / Messianic / Theonomy, minimize or deny supersession; the Torah remains binding to varying degrees.

The codex records each fairly without arbitrating. Add positions and inline tensions as further sources are ingested.

Common questions this page answers

Q: What is the New Covenant?

The New Covenant is the arrangement God promised through Jeremiah (Jeremiah 31:31-34) and inaugurated through Christ's death. Its features: the law written on the heart, universal knowledge of God among His people, full forgiveness of sins, and the indwelling Spirit.

Q: How does the New Covenant differ from the Old?

The Old Covenant put the law on stone tablets; the New writes it on the heart. The Old worked through a priestly mediator; the New gives every member direct access. The Old foreshadowed forgiveness through sacrifice; the New accomplishes it through Christ's once-for-all sacrifice (Hebrews 8-10).

Q: When was the New Covenant inaugurated?

At the Last Supper, when Jesus lifted the cup and said "this cup is the new covenant in My blood" (Luke 22:20; 1 Corinthians 11:25), and consummated at the cross and Pentecost.

Q: Are Christians under the Old Covenant law?

Romans 6:14 says "you are not under law but under grace." Hebrews 8:13 says the Old is "obsolete." Christians are under the law of Christ (Galatians 6:2), which retains the moral law re-expressed in love. See Grace vs Law.

Q: What did Jeremiah predict about the New Covenant?

Jeremiah 31:31-34: a new covenant, not like the Sinai covenant, with God's law written on the heart, universal knowledge of God among His people ("they will all know Me, from the least of them to the greatest"), and the forgiveness of sins God will "remember no more."

Q: What two houses was the New Covenant given to?

The house of Israel and the house of Judah (Jeremiah 31:31; Hebrews 8:8), the northern and southern kingdoms of the divided monarchy. Gentiles share in the covenant through union with Christ, grafted into Israel's tree (Romans 11:17-24), not because they are secretly the lost northern tribes.