The Sixth and Seventh Books of Moses, edited by Joseph Petersen, is a collection of mystical and occult texts that are believed to have been written by the biblical figure Moses. 
 
These books are part of a broader tradition of grimoires, which are texts containing magical rituals, symbols, and instructions for invoking spirits and performing spells.
 
These texts specifically focus on the occult and supernatural knowledge attributed to Moses, blending elements of Jewish Kabbalah, Christian mysticism, and various folk magic traditions. The texts in these books contain detailed instructions on the use of magical seals, invocations, and talismans, often for purposes such as healing, protection, and gaining power over natural forces or spiritual entities.
 
Joseph Petersen's edition is a modern version of these works, aiming to present them in a more accessible form to contemporary readers while retaining the mysterious and esoteric nature of the original manuscripts.