Muhaddith is the term for a scholar who organizes and studies hadiths. This organization provided important assistance in safeguarding the Hadith. Muhadditheen have taken steps to safeguard the hadith collection, such as authoring, revising, and memorizing hadiths, as well as studying the history and traits of the hadith narrators (Ilm Asma-e-Rajjaal). This book describes the lives and works of twelve well-known Muhadditheen.