The compiler collected in this book the books of the famous year, and their lineage to its authors and mentioned the years of their deaths, so it started with the first of those classified in the homeland, then he prolonged the words of the hadith books and its arts from Sahih, Sunnah, series, and correspondence, as the author gathered the names of the most famous in science The Sunnah is from the authenticity of the books, the municipality of the hadith, the parts and the modern hopes, and the literature of hadith science of all kinds, and the multiplicity of its arts, and perhaps it did not deviate from his book, which absorbed most of what is related to this honorable art except for a few things, and this book is considered an inclusive index of the bureau of the honorable Sunnah, and the broad reference for names He wrote