This study examines and classifies the Mahdist reports in Kifāyat al-Athar fī al-Naṣṣ ʿalā al-Aʾimma al-Ithnā ʿAshar, by ʿAlī b. Muḥammad al-Khazzāz al-Qummī. A fourth-century AH work, it is recognized as a collection of reports and explicit textual designations concerning the caliphate and imamate of the Twelve Imams; part of it directly addresses Mahdism and reports concerning Imam al-Mahdi. The study aims to extract and systematize the Mahdist teachings contained in this early source and to assess their evidentiary value in terms of both chains of transmission and content. It employs critical textual analysis of relevant reports, including their thematic identification, classification of Mahdist themes, and examination of their isnāds and transmission routes. The findings indicate that al-Khazzāz al-Qummī included a considerable number of explicit reports concerning the Imamate and the advent of the eschatological savior; some accounts cite approximately 170 related reports. These reports can be classified under several key themes, including the textual designation of the Imamate, the signs and responsibilities of the eschatological reformer, and his lineage and connection to the Ahl al-Bayt. Moreover, the quality of the isnāds and the recurrence of parallel reports across hadith sources from different Muslim traditions enhance the work’s significance within Shi‘i Mahdist discourse.