[2] Dr. Frederick Forbes visited Sinjar in 1838 and ascribed the authorship of the Yazidi Black Book to Sheikh Adi ibn Musafir.
[1][2] The book discusses cosmogony, the creation of humanity, history of the Yazidis and prohibitions in regard to food, deeds and pronunciation of words.
The book begins with cosmogony and continues with how 'God created the white Pearl out of his most precious essence.
Then, Yādīn created humans, animals, birds and beasts, which God put in a pocket of cloth that would come out accompanied by these seven angels.
[5] This is due in part to the rising literacy rate among Yazidis, such that those who can read or write hold a more esteemed position, and the written word is treated as more valid than the oral tradition.