Mohammad Baqer Majlesi was a renowned and very powerful Iranian Twelver Shia cleric, during the Safavid era. He has been described as "one of the most powerful and influential Shi'a ulema of all time", whose "policies and actions reoriented Twelver Shia'ism in the direction that it was to develop from his day on. This book is in fact an encyclopedia of Islamic traditional reports and covers all the major sources of Islamic traditions extant at the time of its compilation.