The Holy Scriptures have both a divine origin for their content and a human history for their creation and preservation. The book of the Bible was not originally one unified book, but rather a collection of various books written over time.
The documentary hypothesis is one of the models used by biblical scholars to explain the origins and composition of the Torah. A version of the documentary hypothesis, frequently identified with the German scholar Julius Wellhausen, was almost universally accepted for most of the 20th century.
The Documentary Hypothesis is a theory, also known as JEDP, that states that the first five books of the Bible, called the Pentateuch consisting of Genesis, Exodus, Leviticus, Numbers, and Deuteronomy, were not written completely by Moses but by different authors.