This book includes letters by Al-Jahiz that have not been published before. They are selected from Al-Jahiz's books and from other books, most of which are out of reach. These letters are about history, literature, sociology, and controversy. He added to it a good collection of his own letters, which he customarily calls "the Brotherhood," and it was a good collection that satisfies the people of literature and satisfies the hunger of those who research and those who love knowledge. Its manuscript or printed origins contained many errors, distortions, mutilations, omissions, and distortions. Therefore, a great deal of effort was spent in evaluating and editing it.