. It is timely to express the Institute's gratitude to all the staff whocontributed to this volume through collecting the hadiths and editing the materials . In the meantime , readers are advised to note the following points : 1 . Single words like " Yes " or " No " are deleted in quoting anecdotes . 2 . Some texts of less authority have not been included here ; however , their references are indicated . 3 . The discourses that Imam al - Mahdi will issue after hisreappearance , all on the basis of authentic hadiths , have been gatheredin a separate chapter . 4 . Some du'as ( supplications ) and ziarat - texts ascribed to Imamal - Mahdi as well as to some of his special delegates , all highly probableto have been related from him , are collected in a separate chapter . ) 5 (