Understanding what is the biblical canon helps Christians know why certain books are included in the Bible while others are not. The term “biblical canon” refers to the recognized collection of sacred writings accepted as the inspired Word of God.
For many readers, the question is simple but important: Who decided which books belong in the Bible, and when was the canon finalized? Throughout history, Jewish and Christian communities carefully recognized authoritative writings based on their spiritual authority, apostolic origin, and consistent teaching.
In this guide, we will clearly explain the meaning of the biblical canon, how the canon of Scripture developed, and why it remains essential for understanding the authority of the Bible today.
What Is the Biblical Canon?
Simple Definition of the Biblical Canon
The biblical canon refers to the official collection of books that are recognized as divinely inspired and accepted as the authoritative Scriptures of the Bible. These books form the foundation of Christian teaching and faith.
In simple terms, the canon answers an important question: Which writings truly belong in the Bible?
Not every ancient religious text was included. Early Jewish and Christian communities carefully recognized specific writings that carried divine authority and faithfully communicated God’s message. Over time, these recognized books formed the canon of Scripture used by believers today.
For most Protestant Christians, the biblical canon includes:
- 39 books in the Old Testament
- 27 books in the New Testament
Together, these 66 books make up the complete Bible recognized in many Christian traditions.
Origin of the Word “Canon”
The word “canon” comes from the Greek term kanōn, which originally meant a measuring rod, rule, or standard. In biblical studies, this word came to describe the standard list of writings that were accepted as authoritative Scripture.
Early Christians used this term to distinguish between:
- writings that were divinely inspired, and
- writings that were helpful but not authoritative.
By using the concept of a “rule” or “standard,” the church clarified which books should guide doctrine, faith, and Christian life.
What the Canon Means in Biblical Studies
In modern biblical scholarship, the biblical canon refers to the finalized collection of sacred texts recognized by the Jewish and Christian faith communities.
Scholars study the canon to understand:
- how the Bible was formed
- how early believers recognized inspired writings
- how different Christian traditions understand the authority of Scripture
The concept of canon also explains why certain ancient writings such as the Gospel of Thomas or other apocryphal texts are not considered part of the official biblical canon.
Ultimately, the canon of Scripture serves as the recognized boundary of the Bible, identifying the writings that faithfully communicate God’s revelation.
What Is the Canon of Scripture in Christianity?
How Christians Define the Canon of Scripture
In Christianity, the canon of Scripture refers to the collection of writings that the church recognizes as the inspired and authoritative Word of God. These books are considered trustworthy sources for understanding God’s message, Christian doctrine, and the life of faith.
Early Christians did not randomly select these writings. Instead, they recognized books that already carried spiritual authority within the believing community. Over time, the church affirmed these writings as the official biblical canon.
Several key characteristics helped believers identify canonical books:
- Apostolic connection – linked to the apostles or their close companions
- Doctrinal consistency – aligned with the teachings of Jesus and the apostles
- Widespread acceptance – used and trusted by many early Christian communities
- Spiritual authority – recognized as inspired by God
These criteria helped guide the recognition of the books that now make up the Bible.
Difference Between Canonical and Non-Canonical Books
Not all ancient religious writings were accepted into the canon of Scripture. While many texts were written during the early centuries of Christianity, only certain writings were recognized as canonical.
Canonical books are those that the church affirmed as inspired and authoritative. These books became part of the official biblical canon.
Non-canonical books, sometimes called apocryphal or extra-biblical writings, may still provide historical insights but are not considered inspired Scripture.
Examples of non-canonical writings include:
- The Gospel of Thomas
- The Gospel of Peter
- The Shepherd of Hermas
Although these writings were known in early Christianity, they did not meet the standards required for inclusion in the biblical canon.
Catholic and Protestant Views of the Canon
While all Christian traditions agree on the 27 books of the New Testament, there are differences regarding the Old Testament canon.
Protestant Bibles contain:
- 39 Old Testament books
- 27 New Testament books
- Total: 66 books
Catholic Bibles include several additional writings known as the Deuterocanonical books, such as:
- Tobit
- Judith
- Wisdom of Solomon
- 1 and 2 Maccabees
These books are accepted in Catholic and Orthodox traditions but are generally not included in the Protestant biblical canon.
Despite these differences, all Christian traditions agree on the central message and authority of the Scriptures.
Who Determined the Canon of the Bible?
Role of the Jewish Community in the Old Testament Canon
The formation of the Old Testament canon began within the Jewish community long before the time of Jesus. Jewish scholars, scribes, and religious leaders carefully preserved sacred writings that recorded God’s covenant, laws, and prophetic messages.
Over centuries, these writings were widely recognized as authoritative Scripture. The Jewish people accepted books such as the Law (Torah), the Prophets, and the Writings as the core of their sacred texts.
By the time of the first century, many of these books were already firmly established in Jewish religious life. Jesus and the early Christians frequently quoted these Scriptures, confirming their authority and importance.
This recognition by the Jewish community played a crucial role in shaping the Old Testament portion of the biblical canon.
Role of the Early Christian Church
As Christianity spread in the first century, new writings began to circulate among believers. These included the Gospels, letters written by the apostles, and other teachings about Jesus Christ.
Early Christian communities read these writings during worship and teaching. Over time, believers began to recognize certain texts as carrying the same spiritual authority as the Old Testament Scriptures.
Church leaders carefully evaluated these writings based on several important factors:
- Connection to an apostle or close associate of an apostle
- Faithfulness to the teachings of Jesus
- Consistency with accepted Christian doctrine
- Acceptance among multiple Christian communities
Through this careful recognition process, the church gradually affirmed the writings that would become the New Testament canon.
Church Councils That Confirmed the Canon
Although the biblical books were already widely recognized, several early church councils helped formally confirm the list of New Testament writings.
Important councils included:
- Council of Hippo (AD 393)
- Council of Carthage (AD 397)
These gatherings of church leaders reviewed the writings used across Christian communities and affirmed the 27 books of the New Testament that Christians recognize today.
It is important to understand that these councils did not “create” the biblical canon. Instead, they officially recognized the books that believers had already accepted as inspired Scripture.
This historical process explains how the canon of the Bible became firmly established within Christianity.
When Was the Biblical Canon Finalized?
Formation of the Old Testament Canon
The Old Testament canon developed gradually over many centuries as the sacred writings of Israel were preserved and recognized by the Jewish community. These writings recorded God’s covenant with His people and became central to Jewish faith and worship.
The earliest portion of this canon was the Torah, also known as the Law of Moses. Over time, additional writings such as the Prophets and the Writings were widely accepted as authoritative Scripture.
By the time of Jesus in the first century, these texts were already treated as sacred and were regularly read in Jewish synagogues. Because of this long history of recognition, the Old Testament canon was largely established before the rise of the early Christian church.
Recognition of the New Testament Canon
The New Testament canon developed during the first few centuries after the life of Jesus. The apostles and their close companions wrote letters, historical accounts, and teachings to guide early Christian communities.
These writings circulated among churches and were read publicly during worship. As Christianity spread, believers began recognizing certain texts as uniquely authoritative because they preserved the authentic teachings of Jesus and the apostles.
Gradually, the church acknowledged a consistent group of writings that included:
- The four Gospels
- The Book of Acts
- The letters of the apostles
- The Book of Revelation
By the fourth century, these 27 books were widely accepted across Christian communities.
Historical Milestones in Canon Recognition
Several historical developments helped confirm the recognition of the biblical canon within Christianity. These moments reflected the growing agreement among churches about which writings belonged in the Bible.
Important milestones include:
- Second century – Early Christian leaders begin listing widely accepted Scripture
- Third century – Churches increasingly agree on the core New Testament writings
- Council of Hippo (AD 393) – Church leaders confirm the accepted New Testament books
- Council of Carthage (AD 397) – The same list of 27 books is officially affirmed
These milestones demonstrate that the canon was not suddenly created but gradually recognized as believers affirmed the writings that faithfully conveyed God’s revelation.
List of Canonical Books of the Bible
Old Testament Canon Overview
The Old Testament canon contains the sacred writings that record God’s relationship with Israel before the coming of Jesus Christ. These books include history, law, prophecy, poetry, and wisdom literature that shaped the faith of the Jewish people and later Christianity.
In the Protestant tradition, the Old Testament includes 39 books. These writings are commonly grouped into several sections:
- The Law (Torah) – Genesis, Exodus, Leviticus, Numbers, Deuteronomy
- Historical Books – Joshua through Esther
- Wisdom and Poetry – Job, Psalms, Proverbs, Ecclesiastes, Song of Solomon
- Prophets – Isaiah through Malachi
These books together form the foundation of biblical history and reveal God’s covenant with His people.
New Testament Canon Overview
The New Testament canon focuses on the life of Jesus Christ and the growth of the early Christian church. It contains 27 books written during the first century by apostles or their close companions.
These books are generally organized into four main categories:
- The Gospels – Matthew, Mark, Luke, and John, which record the life and teachings of Jesus
- Historical Writing – The Book of Acts, describing the early church
- Epistles (Letters) – Writings from apostles such as Paul, Peter, James, and John that guide Christian communities
- Prophetic Writing – The Book of Revelation
Together, these writings explain the message of salvation through Jesus Christ and the teachings that guide Christian faith.
Simple Bible Canon Chart
A Bible canon chart helps readers clearly understand how the books of the Bible are structured within the canonical collection. It visually organizes the Old and New Testament writings to show their relationship within the biblical canon.
A simple canon structure looks like this:
Old Testament (39 Books)
- Law
- History
- Poetry and Wisdom
- Major and Minor Prophets
New Testament (27 Books)
- Gospels
- Acts
- Letters (Epistles)
- Revelation
This structure provides a helpful overview of the canonical books of the Bible and how they are organized within the Christian Scriptures.
Biblical Canon Timeline
Old Testament Writing Period
The earliest stage of the biblical canon timeline begins with the writing of the Old Testament Scriptures. These books were written over many centuries as God’s relationship with Israel unfolded in history.
The process began with the writings of Moses, traditionally dated around the 15th–13th centuries BC. Over time, prophets, historians, and wisdom writers added additional texts that recorded God’s guidance, laws, and promises.
These writings were carefully preserved by Jewish scribes and religious leaders. As they were widely read and accepted in worship and teaching, they gradually became recognized as the sacred Scriptures of Israel.
New Testament Writing Period
The next stage in the timeline occurred during the first century AD, when the apostles and early Christian leaders wrote the books of the New Testament.
These writings were created to:
- Record the life and teachings of Jesus Christ
- Guide early Christian communities
- Preserve apostolic teaching for future believers
The four Gospels were written to provide reliable accounts of Jesus’ ministry. The apostles also wrote letters to churches addressing faith, doctrine, and Christian living.
By the end of the first century, most of the New Testament books had already been written and were circulating among Christian communities.
Key Milestones in Canon Development
After the New Testament writings began circulating, Christian communities gradually recognized which books carried apostolic authority and should be considered part of the canon of Scripture.
Important milestones in this recognition process include:
- 2nd century AD – Early Christian leaders begin identifying authoritative writings used across churches
- 3rd century AD – Greater agreement develops regarding the core New Testament books
- 4th century AD – Church councils confirm the widely accepted list of canonical books
These milestones show that the biblical canon developed through a process of recognition rather than sudden creation, as the church affirmed the writings that faithfully represented the teachings of Christ and the apostles.
Why Is the Canon of Scripture Important?
Establishing the Authority of the Bible
The canon of Scripture is important because it identifies the writings that Christians recognize as the authoritative Word of God. Without a clear canon, believers would not know which texts should guide faith, doctrine, and spiritual life.
By recognizing the biblical canon, the church established a trusted foundation for Christian teaching. These books provide the reliable message of God’s revelation, the life and teachings of Jesus Christ, and the instructions given by the apostles to early believers.
Because the canonical books were widely accepted and preserved by the early church, they continue to serve as the central authority for Christian belief and practice.
Protecting the Church from False Teachings
Another important purpose of the biblical canon is to protect the church from teachings that do not align with the message of Scripture. In the early centuries of Christianity, many writings circulated that claimed to contain spiritual insights or secret teachings.
By recognizing the authentic books of the Bible, early Christian leaders helped ensure that believers followed writings that faithfully represented the teachings of Christ and the apostles.
The canon therefore acts as a safeguard by:
- Preserving authentic apostolic teaching
- Preventing confusion caused by unreliable texts
- Providing a clear standard for Christian doctrine
This helped maintain unity and consistency among Christian communities.
Preserving the Message of Jesus and the Apostles
The final reason the canon matters is that it preserves the original message of Jesus Christ and the apostles. The canonical books contain the historical accounts, teachings, and letters that shaped the early Christian movement.
Through the biblical canon, believers today can still read the same teachings that guided the first followers of Christ. These writings explain the message of salvation, the character of God, and the principles of Christian living.
Because of this, the canon of Scripture remains central to Christian faith, ensuring that the message of the gospel continues to be faithfully passed down from generation to generation.
Conclusion
Understanding what is the biblical canon helps believers see how the Bible came together as the recognized collection of inspired writings. The canon of Scripture developed gradually as Jewish and Christian communities acknowledged texts that faithfully conveyed God’s revelation.
These canonical books preserved the teachings of prophets, apostles, and ultimately the message of Jesus Christ. Over time, the church confirmed these writings as the authoritative foundation for Christian faith and doctrine.
Today, the biblical canon remains essential because it identifies the trustworthy Scriptures that guide believers in understanding God, living faithfully, and preserving the gospel message for future generations.