Sacred Books and Traditions of the Yezidiz, by Isya Joseph, [1919], at sacred-texts.com
Before all creation this revelation was with Melek Ṭâ’ûs, who sent ‘Abd Ṭâ’ûs to this world that he might separate truth known to his particular people.
This was done, first of all, by means of oral tradition, and afterward by means of this book, Al-Jilwah, which the outsiders may neither read nor behold.