Ibn Saba and the Sayfian corpus -- Sayf ibn Umar and the Sabaiya (i): the caliphate of ʻUthman ibn ʻAffan -- Sayf ibn ʻUmar and the Sabaiya (ii): ʻAli ibn Abi Tālib the Battle of the camel -- Excursus: The Sayfian corpus in the riwaya of Naṣr ibn Muzaḥim -- Ibn Saba and the heresiographers -- The execution of Ibn Sabaʻ -- The parousia of ʻAli ibn Abi Ṭalib -- Excursus 1: ʻAli in the clouds -- Excursus 2: The letter of Ali given to Abd Allah ibn Wahb al-Hamdani -- The Sabaʻiya of the Umayyad period.