The Book of Law

The Book of Law was dictated to Aleister Crowley in Cairo between noon and 1PM on 3 successive days. This occurred on April 8, 9, and 10th of 1904. This was dictated by Aiwass who described himself as the minister of Hoor-paar-kraat. He showed knowledge by the use of cipher or cryptogram.

Here is a link to purchase the Book of Law:
Book of the Law