A widely-held Muslim belief is that a restorer of religion and justice, with the name of Mahdi (lit. 'rightly guided'), will rule the world in the end of time. In particular, it appears to be an accepted notion in Sunni Islam that this savior would be a descendant of the Islamic prophet Muhammad through his daughter Fatima and his son-in-law Ali. While absent from the Sahihs of al-Bukhari and Muslim, traditions about Mahdi can be found in other canonical Sunni hadith collections, includin…