The New Testament does not erase or cancel the Old Testament in Christian belief, but different Christian traditions interpret their relationship differently

Christians do not treat the New Testament as a document that deletes the Old Testament. Instead, most Christian churches teach that the New Testament fulfills or completes the Old Testament—meaning the Old Testament remains Scripture, but its meaning and process shift in light of Jesus and the early church's teachings. However, what "fulfillment" means in practice varies significantly between Catholic, Protestant, and Orthodox traditions, and even within those groups.

The core disagreement is not whether the Old Testament still matters, but how its laws, prophecies, and stories explore to Christians today. Some rules from the Old Testament—like the Ten Commandments—are understood as still binding. Others—like the temple sacrifices or dietary laws—are interpreted as no longer required because Jesus's death and resurrection changed their purpose. This distinction shapes how each Christian community reads and uses both testaments.

Key Takeaways

  • The Old Testament remains Scripture in all Christian traditions; no mainstream church teaches it should be discarded or ignored.
  • Christian theology teaches that Jesus and his death fulfill Old Testament prophecies and laws, but this does not mean those texts are erased.
  • Different Christian groups disagree on which Old Testament laws still explore—some say all moral laws do, others say only the Ten Commandments, others say none directly bind Christians.
  • The New Testament itself quotes and references the Old Testament constantly, treating it as authoritative Scripture that points toward Jesus.
  • Early church leaders debated this question intensely and settled on keeping both testaments as Scripture, rejecting the idea that one cancels the other.

What the New Testament says about the Old Testament

The New Testament does not claim to replace the Old Testament. Instead, it repeatedly treats the Old Testament as Scripture that remains true and authoritative. Jesus himself quoted the Old Testament to teach and defend his actions. In Matthew 5:17, Jesus says: "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." The word fulfill here does not mean "erase" but rather "complete" or "bring to their intended purpose."

The apostle Paul, writing to Timothy, calls the Old Testament "Scripture" and says it is "useful for teaching, rebuking, correcting and training in righteousness" (2 Timothy 3:16). Paul also writes that the Old Testament stories were written "for our instruction" as Christians (1 Corinthians 10:11). Throughout the New Testament, Old Testament passages are quoted as proof that Jesus is the Messiah the Old Testament predicted. This pattern shows the New Testament authors saw the Old Testament as Scripture that remained valid and pointed toward Jesus.

How the early church decided to keep both testaments

In the second century, a Christian teacher named Marcion argued that the God of the Old Testament was different from the God of the New Testament, and that Christians should reject the Old Testament entirely and use only a shortened version of the New Testament. The early church councils and church fathers rejected Marcion's view decisively. They affirmed that the Old and New Testaments came from the same God and that both were Scripture.

This decision was formalized over the next few centuries as church councils determined which books belonged in the biblical canon—the official list of Scripture. By the time the Council of Carthage met in 397 CE, the church had settled on a single Bible containing both Old and New Testaments. This choice reflected the church's conviction that the Old Testament was not replaced but rather reinterpreted in light of Jesus's life, death, and resurrection. Rejecting the Old Testament was seen as rejecting God's own word and the history of God's relationship with Israel.

The difference between fulfillment and replacement

Christian theology distinguishes between replacement and fulfillment. Replacement would mean the Old Testament is no longer true or relevant—that it has been erased. Fulfillment means the Old Testament's purpose has been completed or brought to its intended end. Think of it like a building blueprint: once the building is finished, you do not throw away the blueprint because it is no longer needed for construction. Instead, you understand the blueprint in light of the completed building. The blueprint was always pointing toward that building.

In Christian understanding, Old Testament prophecies about a coming Messiah are fulfilled in Jesus. Old Testament laws about animal sacrifice are fulfilled in Jesus's death, which Christians believe was the final sacrifice. The Old Testament temple and priesthood are fulfilled in Jesus, who is understood as the true priest and temple. But fulfillment does not mean those Old Testament texts become false or irrelevant. Rather, their meaning is understood as complete in Jesus. Christians still read the Old Testament to understand God's character, God's promises, and the history of God's people—they straightforward read it through the lens of Jesus and the New Testament.

Which Old Testament laws still explore to Christians

This is where Christian traditions diverge most visibly. The Old Testament contains three types of law: moral laws (like the Ten Commandments), ceremonial laws (like temple sacrifices and food rules), and civil laws (like rules for judges and property). Most Christian traditions teach that the moral laws still bind Christians, but the ceremonial and civil laws do not—or do not in the same way.

However, even this framework is debated. Some Christians argue that all Old Testament laws that are not explicitly repealed in the New Testament still explore. Others say that only laws reaffirmed in the New Testament explore. Still others say that the Old Testament laws show God's character and intent, but Christians are not bound by them because Jesus's death and resurrection changed the covenant between God and God's people. The New Testament itself does not give a single, straightforward rule for how to decide which laws explore. Instead, it shows the early church wrestling with specific questions—like whether non-Jewish Christians had to follow Jewish food laws—and deciding case by case.

Catholic, Protestant, and Orthodox approaches

The Catholic Church teaches that the Old Testament is fully Scripture and remains authoritative, but that the New Testament provides the fuller revelation of God's plan. Catholic theology emphasizes that Jesus is the "fullness" of God's revelation, and that the Old Testament must be read in light of Jesus and the church's tradition. The church does not follow Old Testament ceremonial laws but does teach that the moral laws, especially the Ten Commandments, remain binding.

Protestant churches vary more widely. Some Protestant traditions emphasize that Christians are no longer "under the law" because of Jesus's death and resurrection, and that Old Testament laws are primarily historical or illustrative. Others teach that the moral law of the Old Testament still applies to Christians, even if the ceremonial law does not. Most Protestants agree that the Old Testament is Scripture and should be read and studied, but they differ on how much of it directly governs Christian behavior today.

Orthodox Christianity treats the Old Testament as fully authoritative Scripture and emphasizes the continuity between the Old and New Testaments. The Orthodox view sees the Old Testament as a preparation for the New Testament, with Jesus as the fulfillment of Old Testament types and prophecies. However, like other traditions, Orthodox Christianity does not require Christians to follow Old Testament ceremonial laws.

Why some people think the Old Testament is replaced

The confusion often comes from a few New Testament passages that sound like they are canceling Old Testament rules. For example, in Colossians 2:16-17, Paul writes that Christians should not be judged for not observing Old Testament food laws or festivals because these were "a shadow of the things that were to come; the reality, however, is found in Christ." This passage is sometimes read as saying the Old Testament is no longer relevant. But Paul is not saying the Old Testament is false or should be ignored. He is saying that the ceremonial practices it prescribed have been fulfilled in Jesus and are no longer required for salvation or righteousness.

Another source of confusion is the phrase "the law" in the New Testament. When Paul writes that Christians are "not under the law" (Romans 6:14), he is referring to the Old Testament law as a system of salvation—the idea that following the law earns righteousness before God. Paul is not saying the Old Testament is erased or that its moral teachings no longer matter. He is saying that salvation comes through faith in Jesus, not through obedience to the law. The law still reveals God's character and God's will, but it no longer functions as the path to salvation.

How Christians use the Old Testament today

In practice, Christians read and use the Old Testament extensively. Churches include Old Testament readings in worship services. Preachers teach from Old Testament books. Christians read the Psalms for prayer and comfort. The Old Testament is studied in Christian schools and seminaries. When Christians want to understand God's character—God's justice, mercy, faithfulness, and love—they turn to Old Testament stories and teachings. When they want to understand Jesus, they read Old Testament prophecies that Christians believe Jesus fulfilled.

The Old Testament also provides the historical and theological foundation for the New Testament. Without understanding the Old Testament concept of covenant, sacrifice, priesthood, and messianic expectation, the New Testament's claims about Jesus make less sense. Christian theology teaches that the Old Testament was always pointing toward Jesus, even when the Old Testament authors themselves may not have fully understood that direction. This is why the Old Testament remains central to Christian Scripture and practice, even though Christians interpret and explore it differently than Jewish communities do.

Frequently Asked Questions

If the New Testament fulfills the Old Testament, why do Christians still read it?

Fulfillment does not mean the Old Testament becomes irrelevant—it means its purpose is completed in Jesus. Christians read the Old Testament to understand God's character, to see how God worked in history, to pray with the Psalms, and to understand the prophecies Christians believe Jesus fulfilled. The Old Testament is Scripture and remains authoritative, even though Christians interpret it through the lens of Jesus and the New Testament.

Do Christians have to follow the Old Testament food laws and Sabbath rules?

Most Christian traditions teach that Christians are not required to follow Old Testament ceremonial laws like food restrictions or Sabbath observance. However, they differ on why. Some say these laws were fulfilled in Jesus and are no longer binding. Others say they applied only to ancient Israel. Individual Christians may choose to follow these practices for spiritual reasons, but they are not required for salvation or righteousness in mainstream Christian teaching.

What about the Ten Commandments—do those still explore?

Yes, nearly all Christian traditions teach that the moral content of the Ten Commandments still applies to Christians. However, Christians understand the Sabbath commandment differently than the Old Testament prescribes—most Christian churches worship on Sunday rather than Saturday, and they do not follow the Old Testament's detailed Sabbath rules. The other nine commandments are understood as expressing God's moral will that remains binding.

Did the early church ever seriously consider removing the Old Testament from the Bible?

Yes. Marcion, a second-century Christian teacher, argued that Christians should reject the Old Testament and use only a shortened New Testament. However, the early church rejected his view decisively. Church leaders affirmed that both testaments were Scripture and came from the same God. This decision shaped the Bible as it exists today, with both Old and New Testaments included.

If Jesus fulfilled the Old Testament, why wasn't the Messiah supposed to do more?

Christians believe Jesus fulfilled the Old Testament prophecies about the Messiah, but they understand those prophecies as pointing to two comings: Jesus's first coming to die for sin and his second coming to judge and restore all things. The Old Testament prophecies Christians believe Jesus fulfilled in his first coming are those about a suffering servant and a sacrifice for sin. Prophecies about a king ruling in peace and justice are understood as pointing to Jesus's future return.