The formation of the Bible's canon, the collection of authoritative scriptures recognized by religious communities, was not a singular event but a long, complex historical process spanning centuries. For early Christians, the Jewish scriptures, what would become the Old Testament, already held significant authority. The challenge lay in identifying and validating the writings that would form the New Testament. This process involved discerning which texts were genuinely apostolic, reflecting the teachings of Jesus and his followers, and which were spurious or heretical. Over time, through a combination of communal consensus, theological debate, and the influence of key figures and councils, a distinct collection of books emerged, solidifying the Bible as we know it today.
The early Christian church inherited the Hebrew Bible, often referred to as the Old Testament, which was already a canonized collection within Judaism. The Septuagint, a Greek translation of the Hebrew scriptures dating from the 3rd to 2nd centuries BCE, played a crucial role in disseminating these texts among Greek-speaking Jews and early Christians. While there were some variations in the precise contents of the Old Testament canon among different Jewish groups and later Christian denominations, the core books were widely accepted. For instance, the Council of Jamnia, traditionally dated around 90 CE, is often cited as a significant moment in solidifying the Jewish canon, though scholarly debate continues regarding its precise impact and timing. Regardless, the Old Testament provided the foundational scriptural background for Christianity.
The New Testament canon's development was more protracted and contentious. The earliest Christians relied on oral traditions and the teachings of apostles. As these traditions were committed to writing, a multitude of gospels, epistles, and other writings circulated within nascent Christian communities. Distinguishing authentic apostolic literature from pseudepigrapha and heretical texts became a pressing concern. Early church fathers like Irenaeus of Lyons (c. 130-202 CE) and Clement of Alexandria (c. 150-215 CE) began to identify and quote from a growing corpus of New Testament writings. Irenaeus, for example, explicitly referenced the four Gospels (Matthew, Mark, Luke, and John) and several Pauline epistles, arguing against Marcion's restrictive canon which excluded most of the Old Testament and contained a heavily edited Luke.
Several key figures and events significantly influenced the eventual shape of the New Testament canon. The Muratorian Fragment, a Latin document from the late 2nd century, lists many of the books that would become canonical, though it omits Hebrews, James, and 1 & 2 Peter, and includes the Shepherd of Hermas, which was later excluded. Origen of Caesarea (c. 184-254 CE), a prolific scholar, further contributed by discussing the authenticity of various texts, distinguishing between universally accepted books and those whose authenticity was debated. His work, though sometimes inclusive of disputed texts, highlights the ongoing process of discernment.
The formalization of the New Testament canon accelerated in the 4th century. Emperor Constantine's conversion and the subsequent Edict of Milan in 313 CE brought Christianity into the open, leading to a greater need for standardized scriptures. At the Council of Nicaea in 325 CE, while primarily focused on theological issues like the nature of Christ, the question of scriptural authority indirectly arose. Later, Pope Damasus I commissioned the translation of the Bible into Latin (the Vulgate), and his Council of Rome in 382 CE is often credited with producing one of the earliest lists of canonical books that closely resembles the modern New Testament. The definitive lists were further confirmed by subsequent councils, notably the Council of Hippo in 393 CE and the Council of Carthage in 397 and 419 CE. These councils, influenced by the theological pronouncements of figures like Augustine of Hippo, cemented the 27 books of the New Testament that are recognized by most Christian traditions today. The process was not about divine revelation dictating the list, but rather about the church, guided by the Holy Spirit, recognizing the texts that had proven their apostolic authority and theological soundness through centuries of use and debate.