Here is presented for the first time the 'Accretion Theory' of Biblical textural study, a case of the 'Documentary Hypothesis' which stresses the distinction between the sources making up the Pentateuch, or five Books of Moses. The Accretion Theory pursues this approach further, from Genesis through Kings, while also distinguishing even more subtle sources and refinements, and developing a revised and surprising timeframe for text composition. Within it establishes the predominant distinction between the two most early sources does not arise from one being from the ancient Kingdom of Israel and the other in the Kingdom of Judah, but from one being composed for a God of fire and earthquakes, and the other for a God of wind and storms. This new conception likewise reveals that the fundamental motive force throughout the editorial process behind the formation of the Hebrew Bible or Old Testament arose from the outlook and sway of two distinct priesthoods, who through a process of divergence and union, and through the tumults of relentless historical upheavals, brought into being the most influential work of literature ever written.