Buy now By (author) Mohammad Ali Amir-Moezzi Translated by Maria De Cillis Orkhan Mir-Kasimov Additional contributors Series Shi‘i Heritage Series Publication year 2023 Format Hardback Paperback ePDF Ebook One of the most celebrated religious authorities and a foundational figure of Shiʿi Islam, Muḥammad ibn Yaʿqūb al-Kulaynī (d. ca. 940 CE) set out an extraordinarily wide-ranging and coherent set of doctrinal and legal traditions derived from the Shiʿi Imams, thus playing a leading role in the unification and, consequently, the consolidation of the Imami faith. His Book of the Proof (Kitāb al-Ḥujja), part of the Sufficient Book (Kitāb al-Kāfī), is considered the first among the four most important works on Shiʿi hadith, and its significance for the formation and development of Shiʿi beliefs and doctrines cannot be overestimated.