Ismailiyya Doctrine: Pre-Fatimid and Fatimid times

Nothing definite is known about the doctrine of the early supporters of the imamate of Isma'iland his son Muhammad. Imami sources maintain that the Khattabiyya [q.v.], the followers of the
extremist Shi'i Abu 'l-Khattab [q.v.], constituted the bulk of the early Isma'iliyya. Later Isma'ili
doctrine, however, generally condemns Abu 'l-Khattab and does not appear to be substantially
influenced by the heresies ascribed to him and his followers (see W. Ivanow, Ibn al-Qaddah,
Bombay 1957). The Umm al-kitab preserved by the Isma'ilis of Bada