Old Testament: The Single Author Theory –
For at least 1,000 years, both Jewish and Christian tradition held that a single author wrote the first five books of the Bible—Genesis, Exodus, Leviticus, Numbers and Deuteronomy. That single author was believed to be Moses, the Hebrew prophet who led the Israelites out of captivity in Egypt and guided them across the Red Sea toward the Promised Land.
The Old Testament: Various Schools of Authors –
To explain the Bible’s contradictions, repetitions and general idiosyncrasies, most scholars today agree that the stories and laws it contains were communicated orally, through prose and poetry, over centuries
New Testament: Who Wrote the Gospels?
Named for Jesus’s most devoted earthly disciples, or apostles—Matthew, Mark, Luke and John—the four canonical Gospels were traditionally thought to be eyewitness accounts of Jesus’s life, death and resurrection. The stories that form the basis of Christianity were first communicated orally, and passed down from generation to generation, before they were collected and written down.