Shah Waliullah of Delhi in his two books (1) Musalsalat, well known as Fazl-ul-Mubin and (2) Nawadir, has reported a tradition of the Prophet through "the Imam of the present period, the concealed Imam, Mohammad Mahdi; son of the Imam Hasan Al-Askari".
Umri wangu kwa sasa hivi ni miaka 620." Sheikh Hasan Iraqi anaelezea kuwa mazungumzo haya yamepita miaka mia moja iliyopita(yaani wakati huo umri wa Imam Mahdi a.s. ulikuwa wa miaka 720).