Ibn Babawayh – also known as al-Shaykh al-Saduq – was a prominent Twelver Shi'i scholar of hadith. Writing within the first century after the vanishing of the twelfth imam, al-Saduq represents a pivotal moment in Twelver hadith literature, as this Shi'i community adjusted to a world without a visible imam and guide, a world wherein the imams could only be accessed through the text of their remembered words and deeds. George Warner’s study of al-Saduq’s work examines the formation of Shi'i hadith literature in light of these unique dynamics, as well as giving a portrait of an important...