Book of Numbers twelve princes, one of each tribe. The majority of modern biblical scholars believe that the Torah (the books of Genesis, Exodus, Leviticus, Numbers, and Deuteronomy) reached its present form in the post-Exilic period (i.e., after c.520 BCE), based on pre-existing written and oral traditions and "contemporary geographical and demographic details but even more importantly from contemporary political realities". The five books are often described as being drawn from four "sources" - schools of writers rather than individuals - the Yahwist and the Elohist (frequently treated as a single source), the Priestly source and the Deuteronomist. There is ongoing dispute over
Development of the Old Testament canon phrase "Old Testament", which is associated with Supersessionism. The first list of Old Testament books compiled by a Christian source is recorded by the 4th century historian Eusebius. Eusebius describes the collection of a 2nd century bishop, Melito of Sardis. Melito's list, dated to circa 170, the result of a trip to the Holy Land (probably the famous library at Caesarea Maritima) to determine both the order and number of books in the Hebrew Bible, instead seems to follow the order of the books presented in the Septuagint. Melito's list, as cited by Eusebius, as follows: According to Archibald Alexander,