What’s the Difference Between the Old and New Testament?

If you have ever wondered why the Bible is divided into an Old Testament and a New Testament, you are not alone.

At first, the two sections can seem very different. The Old Testament contains laws, sacrifices, prophets, kings, wars and the history of Israel, while the New Testament focuses on Jesus, the early Church and the message of salvation through Him. This can sometimes make people wonder whether the God of the Old Testament is different from the God of the New Testament.

He is not.

The Old Testament and New Testament are two parts of the same story. They show us God’s relationship with humanity, our need for salvation and God’s plan to redeem us through Jesus Christ.

The Old Testament points forward to the coming Messiah, and the New Testament reveals that Messiah as Jesus.

The Bible Has Two Testaments

The word testament can refer to a covenant or agreement. The Old Testament focuses largely on God’s covenant relationship with Israel, while the New Testament explains the new covenant established through Jesus Christ.

The Old Testament contains 39 books in the Protestant Bible, beginning with Genesis and ending with Malachi. The New Testament contains 27 books, beginning with Matthew and ending with Revelation.

Together, these 66 books tell one unfolding story.

The Old Testament Points Forward

The Old Testament begins with creation and shows how sin entered the world, how humanity became separated from God and how God began working through a particular people to accomplish His purposes.

God made a covenant with Abraham and his descendants, formed the nation of Israel and gave them His Law. Throughout the Old Testament, God also gave promises about a coming Saviour and King.

The Old Testament was not simply a collection of unrelated stories.

It was preparing the way for Jesus.

The New Testament Reveals the Fulfilment

The New Testament begins with Jesus Christ.

Matthew opens by connecting Jesus to the history and promises of Israel, and the four Gospels tell us about His life, teaching, death and resurrection. Acts then records the beginning and spread of the early Church, followed by letters that teach Christians how to live in light of the Gospel. Revelation points toward Christ’s final victory and the fulfilment of God’s purposes.

The New Testament shows us that Jesus is the Messiah the Old Testament was pointing toward.

What Is the Old Testament About?

The Old Testament covers a very long period of history and contains different types of books, but one of its major themes is God’s relationship with Israel and His plan of redemption.

The first five books are often called the Law or the Torah. They include Genesis, Exodus, Leviticus, Numbers and Deuteronomy. These books describe creation, humanity’s fall into sin, God’s covenant with Abraham, the formation of Israel, the Exodus from Egypt and the Law God gave to Israel.

The historical books continue the story of Israel, including the period of the judges, the kings, the division of the kingdom, the exile and the return.

The wisdom and poetry books include Job, Psalms, Proverbs, Ecclesiastes and Song of Solomon. These books deal with worship, suffering, wisdom, relationships, God’s character and what it means to live before Him.

The prophetic books contain messages from God’s prophets calling people back to Him, warning of judgment and giving promises of restoration and the coming Messiah.

All of this forms part of the larger story that eventually leads us to Jesus.

What Is the New Testament About?

The New Testament focuses on Jesus Christ and what His life, death and resurrection mean for humanity.

The first four books, Matthew, Mark, Luke and John, are the Gospels. They each give an account of Jesus’ ministry, His teaching, His death on the cross and His resurrection.

Acts continues the story after Jesus’ resurrection and describes the coming of the Holy Spirit and the spread of the Gospel.

The letters, or epistles, explain the Gospel and teach Christians how to live as followers of Jesus.

Revelation looks toward the future and describes Christ’s ultimate victory, God’s judgment and the establishment of His eternal kingdom.

The New Testament is therefore not a completely separate story from the Old Testament. It is the continuation and fulfilment of what God had been doing throughout the Old Testament.

The Old Testament Promised a Saviour

One of the most important things to understand about the Old Testament is that it repeatedly points toward Jesus.

God promised that a Saviour would come, and the Old Testament contains many prophecies and promises that find their fulfilment in Christ.

For example, Isaiah spoke of a coming child who would be called “Immanuel.”

Isaiah 7:14 — The Promise of Immanuel

“Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.”

Matthew later connects this prophecy with the birth of Jesus.

Matthew 1:22–23 — Jesus Fulfils the Prophecy

“Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying,

Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.”

This is one example of how the two Testaments connect.

The Old Testament gives the promise, and the New Testament shows its fulfilment in Jesus.

The Old Testament Points to Jesus

Jesus Himself taught that the Old Testament was pointing toward Him.

After His resurrection, Jesus spoke with His disciples about the Scriptures and explained how they pointed to the Messiah.

Luke 24:44 — Jesus Explained the Scriptures

“And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me.”

Jesus did not treat the Old Testament as an unrelated collection of ancient writings.

He showed that the Scriptures were pointing toward Him.

This is why reading the Old Testament is still important for Christians today. It helps us understand the promises, history, symbols and prophecies that give us a deeper understanding of Jesus.

The Old Testament Law and the New Covenant

One of the biggest differences people notice between the Old and New Testaments is the Law.

The Israelites were given laws concerning worship, sacrifices, food, festivals, purification and many other aspects of life. These laws were part of God’s covenant with Israel.

When Jesus came, He established the new covenant through His death.

Jeremiah 31:31–33 — God Promised a New Covenant

“Behold, the days come, saith the LORD, that 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 bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith the LORD:

But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.”

This promise was given hundreds of years before Jesus came.

The New Testament shows us its fulfilment through Christ.

Jesus Established the New Covenant

At the Last Supper, Jesus spoke about the new covenant that would be established through His blood.

Luke 22:20 — Jesus and the New Covenant

“Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.”

Jesus’ death on the cross established the new covenant.

This is why Christians are not under the Old Covenant in the same way Israel was. We come to God through Jesus Christ and the new covenant He established.

Does the New Testament Replace the Old Testament?

It is sometimes said that the New Testament simply replaces the Old Testament, but that can give the wrong impression.

The New Testament fulfils the Old Testament.

Jesus did not come to tell us that the Old Testament was meaningless.

Matthew 5:17 — Jesus Came to Fulfil the Law

“Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.”

Jesus fulfilled what the Old Testament was pointing toward.

The Old Testament still matters because it helps us understand God’s holiness, humanity’s sin, God’s covenant promises and the coming Messiah.

The New Testament shows us how those promises come together in Jesus.

Are Christians Still Under the Old Testament Law?

Christians are not under the Old Covenant as a means of being justified before God.

We are saved by grace through faith in Jesus Christ, not by keeping the Old Covenant ceremonial and sacrificial system.

Paul explains that the Law pointed toward Christ.

Galatians 3:24–25 — The Law Pointed Us to Christ

“Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith.

But after that faith is come, we are no longer under a schoolmaster.”

This does not mean the Old Testament is useless or that God’s moral standards no longer matter.

The New Testament actually teaches Christians to live holy lives and love God and others.

What changed is the covenant relationship through which we approach God.

We are not saved by keeping the Law. We are saved through faith in Jesus.

What Is the Main Difference Between the Old and New Testaments?

The simplest way to understand the difference is to look at the covenant and the focus of each Testament.

The Old Testament records God’s covenant dealings with Israel and points forward to the coming Messiah. The New Testament records the coming of Jesus, His death and resurrection, the establishment of the new covenant and the spread of the Gospel to the nations.

The Old Testament says, in many different ways, a Saviour is coming.

The New Testament tells us, the Saviour has come.

The Old Testament Shows Our Need for a Saviour

Another important purpose of the Old Testament is showing us how desperately humanity needs God.

The Law reveals God’s holiness, but it also reveals our inability to make ourselves righteous through our own efforts.

Romans 3:20 — The Law Reveals Sin

“Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.”

The Law shows us what sin is.

It shows us God’s standard.

It also shows us that we cannot save ourselves by simply trying harder.

That prepares us to understand why Jesus had to come.

Jesus Is the Fulfilment of God’s Plan

The New Testament reveals that salvation was not God’s backup plan.

Jesus’ coming was part of God’s plan of redemption.

Galatians 4:4–5 — Jesus Came at the Right Time

“But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,

To redeem them that were under the law, that we might receive the adoption of sons.”

Jesus came at the right time to accomplish what God had promised.

His death and resurrection provide the salvation that the Old Testament was pointing toward.

The Old and New Testaments Have the Same God

Some people read about judgment and difficult events in the Old Testament and wonder whether the God of the Old Testament is different from the God revealed in Jesus.

He is not.

The same God who is holy and just in the Old Testament is the God who shows mercy and grace through Jesus.

And the same Jesus who demonstrates incredible compassion also teaches about judgment.

God has always been both holy and merciful.

Exodus 34:6–7 — God Reveals His Character

“And the LORD passed by before him, and proclaimed, The LORD, The LORD God, merciful and gracious, longsuffering, and abundant in goodness and truth,

Keeping mercy for thousands, forgiving iniquity and transgression and sin, and that will by no means clear the guilty; visiting the iniquity of the fathers upon the children, and upon the children’s children, unto the third and to the fourth generation.”

God’s character has not changed.

The New Testament does not introduce a kinder God who is different from the God of the Old Testament.

Instead, it shows us the fullness of God’s plan to bring salvation through His Son.

Why Do We Need Both Testaments?

We need both because they help us understand the whole story.

If we only read the New Testament, we can understand Jesus, His death and resurrection, salvation and the Church, but we can miss much of the background that makes those things meaningful.

The Old Testament helps us understand why Jesus is called the Messiah, why His death matters, what the promises of God were and why humanity needs redemption.

The New Testament then shows us how those promises are fulfilled.

Together, they give us a much fuller picture of God’s plan.

The Old Testament Points Forward and the New Testament Points Back to It

There is a beautiful connection between the two Testaments.

The Old Testament looks forward to Christ.

The New Testament looks back at Christ’s coming and explains what His life, death and resurrection accomplished.

This means that the Bible is not two unrelated books placed together.

It is one unfolding story of God’s work in creation and redemption.

2 Timothy 3:16–17 — All Scripture Is Useful

“All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:

That the man of God may be perfect, throughly furnished unto all good works.”

Paul was referring to Scripture that existed at the time, which included the Old Testament.

This reminds us that the Old Testament is still God’s Word and is valuable for Christians today.

How Should Christians Read the Old Testament?

We should read the Old Testament in light of the whole Bible.

Some commands were specifically given to Israel under the Old Covenant and are not commands Christians are required to follow today. At the same time, the Old Testament teaches us important truths about God’s character, sin, holiness, faith, obedience, worship and His plan of redemption.

Most importantly, we should look at how the Old Testament points toward Christ.

Jesus is not an afterthought added to the Bible at the end.

He is central to God’s plan of salvation.

What Is the New Testament Really About?

Although the New Testament contains history, letters, teaching and prophecy, its central message is Jesus.

Jesus came into the world, lived without sin, died for our sins, rose again and offers salvation to those who put their faith in Him.

John 3:16 — The Heart of the Gospel

“For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.”

The Old Testament shows us the problem of sin and points toward God’s solution.

The New Testament reveals that solution in Jesus Christ.

So, What’s the Difference Between the Old and New Testament?

The Old Testament and New Testament are different, but they are not separate stories.

The Old Testament records God’s covenant dealings with Israel, gives the Law, tells the history of God’s people, contains wisdom and poetry, and includes the words of the prophets. Throughout all of this, it points forward to the coming Messiah.

The New Testament reveals Jesus as that Messiah. It tells us about His life, death and resurrection, explains the new covenant established through Him, records the beginning of the Church and teaches believers how to live as followers of Christ.

The Old Testament points forward to Jesus.

The New Testament reveals Jesus.

The Old Testament gives us the promises.

The New Testament shows us their fulfilment.

And both Testaments reveal the same faithful God who has been working throughout history to bring humanity back to Himself.

Jesus Is the Centre of the Story

When you read the Bible this way, the two Testaments begin to make much more sense.

Genesis begins the story, the prophets point toward what is coming, the Gospels introduce us to Jesus, and the rest of the New Testament explains what His death and resurrection mean and looks forward to His return.

The Bible is ultimately telling us about God’s plan of redemption.

And at the centre of that plan is Jesus Christ.

So if you have ever wondered why we need both the Old and New Testaments, the answer is simple: the Old Testament helps us understand the promise, and the New Testament shows us the fulfilment of that promise in Jesus.

Both are important.

Both are God’s Word.

And together they show us the beautiful story of God’s faithfulness from beginning to end.

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