"Ra'aya Meheimna" is distributed over several "parashiyot" throughout the Zohar. Part of it is known and even printed on separate pages, and part of it is weaved into the body of the Zohar. "Ra'aya Meiheimna" is found in Vols. 2 and 3 of the Zohar, but is not found explicitly in Vol. 1. Several great rabbis and sages have tried to find the "Ra'aya Meheimna", which originally is a vast book on all the 613 mitzvot, and arrange it according to the order of positive commandments and negative commandments, and even print it as a book on its own.