The Book of the Law, the holy text that forms the basis of Thelema, was transmitted to Crowley by the entity known as Aiwass in Cairo, on three successive days during April 1904. Acting as a medium, Crowley recorded the communications on hotel notepads and later organized his automatic writing into a short, coherent document. Aiwass/Crowley presents The Book of the Law as an expression of three god-forms in three chapters: Nuit, Hadit, and Ra-Hoor-Khuit.

The Book of Baruch is a Bible pseudepigrapha; a deuterocanonical work attributed to Baruch ben Neriah, the scribe of the prophet Jeremiah. The Assumption of Moses is a Jewish apocryphal work concerning hidden prophecies that Moses revealed to Joshua prior to the latter inheriting his leadership of the ancient Jews. Together these works constitute typical examples of popular Biblical texts which are extra-canonical; most Christian and Jewish groups do not regard their contents as true. Their origins are definitively proven to be several centuries after the time they purport to be from. However, theological scholars have expressed some interest, particularly given the time and context of the writing; being as these pseudepigrapha are old texts, they themselves carry value. This edition contains a lengthy, explanatory introduction by W. O. E. Oesterley, and the well-regarded translations of Bible scholars R. H. Charles (for Baruch) and William John Ferrar (for Moses).