The book of the classes of Al -Mudllasin by Ibn Hajar is considered one of the valuable references for researchers in the specialty of hadith sciences in particular and most of the jurisprudential and Islamic writings in general, where the book of the classes of Al -Mudllasin by Ibn Hajar is within the framework of the field of specialization in modern science and is related to other fields, especially jurisprudence and interpretation, and the studies of the Prophet's biography, And Islamic culture.