Abu Jaʿfar Muhammad ibn al-Hasan ibn Farrukh al-Araj, popularly known as Sheikh as-Saffar al-Qummi (d. 290 AH / 902-903 CE), was a contemporary of the tenth and eleventh
Imams. He was probably the disciple of the eleventh, and an acquaintance of his son, Imam Mahdi. He was one of the earliest systematic compilers of Hadiths about Imamat Theology, constituting the basis of early Twelver metaphysics and mystical theology. His greatest work, which is also the only one that has survived, is
Baṣāʾir ad-Darajāt fi ʿUlūm ʾĀle Muḥammad wa-mā khaṣṣahumu--Allāh. It was edited in Iran under the title
Baṣaʾir ad-Darajāt al-Kubrā fī Faḍāʾil ʾĀle Muḥammad. In addition to being a Hadith compiler, Sheikh as-Saffar al-Qummi is himself also known as a prominent narrator of Hadith. ==Characteristics==