Kulaynī, Muḥammad ibn Yaʻqūb, -941? Kāfī

Al-Kafi (Arabic: ٱلْكَافِي, al-Kāfī, Translated from Arabic means 'The Sufficient') is a hadith collection of the Twelver Shī‘ah tradition, compiled in the first half of the 10th century CE (early 4th century AH) by Muḥammad ibn Yaʿqūb al-Kulaynī (c. 868–941). It is one of the Four Books (Kutub al Arba'a) in Twelver Shi'i Islam. It is divided into three sections: Uṣūl al-Kāfī, dealing with epistemology, theology, history, ethics, supplication, and the Qurʾān; Furūʿ al-Kāfī, which is concerned with practical and legal issues; and Rawdat (or Rawḍat al-Kāfī), which includes miscellaneous traditions, many of which are lengthy letters and speeches transmitted from the imams. In total, al-Kāfī comprises 16,199 narrations. It reportedly took him twenty years to finish the book.