Mufaddil said: O My Master! How will his [Hazrat Mahdi (as)] coming be? (Sadik) said: O Mufaddil! He will come in doubt, but his name will spread, his command will be known, he will be known by his name and title, his family can be elucidated, and he will be discussed by those who accept him and those who do not, those who recognize and those who deny him; we have set out his name and epithet, we have given him the name of the Prophet (saas), his ancestor, so that people should not say they do not know his name and title.
(Bihar al-Anwar, Vol. 53)