Sunni traditionist. Native of Qazvin, Iran. Author of Kitab al-sunan, which contains approximately four thousand traditions and is one of the six canonical collections of Sunni hadith. Though highly praised by some, his work is criticized as containing many questionable (“weak”) traditions. The work was first given canonical status in the early twelfth century but was not widely recognized until a century later. Some scholars, such as al-Nawwawi (d. 1277) and Ibn Khaldun (d. 1405), did not consider his collection of hadiths reliable enough to be authoritative.