The category of Imamate has long been the focus of all scholars and theologians of the Islamic community. Many theologians and scholars have written in this field. All discussions in this field revolved around Imamate and proving this position for Ahl al-Bayt, peace be upon them, but different interpretations and directions were observed in them. One interpreted Imamate as caliphate, one used the term ``Alam'' for Imam, another interpreted it as "Hujjat", but all of them looked at Imamate through their own lenses. According to the above interpretations, religious authority is one of the windows to look at the category of Imamate.

In this article, the author has focused on one of the oldest Shia hadith heritages, namely the Book of Al-Hijjah by the late Kilini. The mission of this article is to firstly introduce the religious authority and then examine the similarities between its topics and the topics of the Book of Al-Hijjah. This research, after examining the conceptual and factual identity of the title of proof with the title of religious authority, has analyzed its chapters. The result of this research is to first prove the antiquity of the concept of religious authority until the clinical time and then to prove the acceptability of religious authority in the clinical view.