The book of the titles of the Companions and the followers of the two authentic assistants, called the titles, is considered an important reference for researchers and specialists in the field of studies of Hadith Hadith; Where the book of the titles of the Companions and the followers of the two correct Musnadin, called the titles in the scope of the science of hadith and the branches, is closely related to jurisprudence sciences, biography and other branches of the Prophet's guidance