A book in the science of hadith, which is a brief book on the issue of writing the hadith and the hatred of the Messenger and the Companions for it, and the reasons for that hatred, and a statement that the start of writing was due to the absence of the illness, with mentioning the sayings of the book and poets in the book, so he mentioned the virtue of books and news those who have most collected books, and whoever about me reading it They were preserved, as if he intended to refer to the bone of the book and its gravity in order to think of it and fear it. It is a unique and important book on its subject