The present study discusses the scarce available data about Abū Yaʿlā al-Jaʿfarī and shows that he, rather than al-Murtaḍā, is the author of the tract, which circulated under titles such as Risālat al-ḥujja fī l-imāma and Masʾala fī bayān imāmat al-aʾimma al-ithnay ʿashar....
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