The canon of Scripture is the collection of books recognized as God’s Word and accepted as authoritative for faith and life. The word canon means a rule or standard. Protestant Bibles contain 66 books: 39 in the Old Testament and 27 in the New Testament.
In the evangelical understanding, the church recognized the authority of these books because they were inspired by God, that is, written by human authors under the guidance of the Holy Spirit. This recognition developed over time through the reading, teaching, and shared life of Christian communities. There was broad agreement about many books, while others were discussed for longer.
The Scriptures received by Israel
The Old Testament brings together the writings preserved by the people of Israel, including the Law, historical accounts, poetry, wisdom, and the prophets. These books describe creation, human sin, God’s promises, and his covenant with Israel. They prepare readers to understand who Jesus is and what he has done.
Jesus treated Israel’s Scriptures as authoritative and showed that they pointed to him. In Luke 24:44, he referred to the Law of Moses, the Prophets, and the Psalms as he explained the fulfillment of what had been written about him. This passage shows the continuity between his mission and the Scriptures his disciples already knew.
The 39 books of the Protestant Old Testament contain the same material as the Hebrew Bible, although their arrangement and order differ. In Jewish tradition, some books that appear separately in our Bibles are counted together. Differences in the number of books therefore do not always mean differences in content.
The witness of Jesus and the apostles
The New Testament emerged as the message of Jesus was proclaimed and the apostles, the messengers he chose to be his witnesses, shared their testimony. The Gospels present his life, death, and resurrection. Acts recounts the early spread of the church, the letters guide Christian communities, and Revelation proclaims Christ’s victory and the ultimate hope of God’s people.
These writings were read and shared among the churches. In Colossians 4:16, Paul instructs communities to exchange letters, showing that his teaching was meant to circulate. In 2 Peter 3:15-16, Paul’s letters are mentioned alongside the other Scriptures, an indication that they were being recognized as authoritative writings.
This process did not unfold in the same way everywhere. The distance between communities and questions about the origins of certain writings contributed to debates about some books. Hebrews and Revelation, for example, were not accepted equally quickly in every region, though both were received into the final collection of New Testament books.
How the church recognized the books
Important factors included a connection to the apostles, faithfulness to the teaching received from Jesus, and continued reading in the churches. An apostolic connection could mean authorship by an apostle or by someone associated with their witness, such as Mark or Luke. These factors helped distinguish writings received as Scripture from other religious texts.
This was not a checklist applied automatically. Communities considered the origins and content of the writings as they received, copied, and taught them. A text could be ancient and useful without belonging to the canon; it could also bear an apostle’s name without actually coming from that apostle.
In the fourth century, lists and decisions by councils, gatherings of church leaders, documented the recognition of the 27 books of the New Testament. These decisions reflected an earlier process of acceptance. In Christian belief, inspiration comes from God; recognition by the church identifies the books received as his Word.
“All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness.”
2 Timothy 3:16
This statement explains the divine origin and usefulness of Scripture, but it does not provide a list of its books. We should therefore distinguish what the text teaches about inspiration from the history of how the canon was recognized. Biblical authority guides the church and also corrects its beliefs and practices.
Why do some Bibles have more books?
Catholic and Orthodox Christians accept Old Testament books that are not part of the Protestant canon. Catholics call these books deuterocanonical, meaning books recognized at a later stage, while Orthodox traditions have their own distinctive collections. These differences reflect different histories of how ancient writings were passed down and received, and should be explained respectfully.
The major Protestant, Catholic, and Orthodox traditions accept the same 27 books of the New Testament. The main difference concerns the Old Testament. For evangelicals, the 66 books form the written standard of faith against which church teaching, traditions, and personal experiences should be evaluated.
A Word for all nations
Understanding the canon helps us grasp what we want to share when we speak of bringing the Bible to the peoples of the world. Mission includes translating, teaching, and making the whole of Scripture accessible, helping people know Christ and grow in faith. In Matthew 28:19-20, Jesus commands his followers to make disciples of all nations and teach them to obey what he commanded.
Unreached peoples are ethnic groups whose local Christian community, if there is one, is still too small to bring the gospel to the whole group without outside help. We can pray for these peoples. This includes asking for clear translations, audio resources, and people equipped to teach the Bible. It also includes interceding so that new readers understand each passage in context and recognize the witness of Scripture to Jesus.
