Maqrizi says that the members of ʿAbdullah sect who attained to the highest grade became muʿattil and ibahi (Maq. i. 348). Strictly speaking the former term denotes one who denies that the universe has a creator, and therefore implies that the initiated held the doctrine common to most of the Arabic “philosophers” of the eternity of matter. This teaching was one of the leading charges brought by the orthodox Muslims against Aristotle. The second term seems to mean “one who admits as (or makes) allowable,” and implies what would be described as antinomianism. Maqrizi continues that the initiated “did not any longer recognize any moral law, nor expect either punishment or future reward” (id.). The historian Nuwayri gives the same account of the Qarmatian branch of the Ismaʿilian sect. Such antinomianism is not at all unknown amongst Muslim devotees: thus Maqrizi (ii. 432) in another passage refers to the Qalandariya darwishes as a type of Sufis who disregard fasting and prayer, and have no reluctance to use any form of self-indulgence, saying that it is sufficient that their hearts are at peace with God. These darwishes were of Persian origin and appeared in Syria in the 7th cent. A.H., but their order had its beginning in the 5th cent. Antinomian ideas appear with the later Murjiʿites of the 2nd cent., and are represented in the doctrines of Jahm b. Safwan, who was put to death about 131, and was, characteristically enough, a Persian convert in rebellion against the Arab Khalif. Amongst these Murjiʿites we find the doctrine to assume the system of those who believed in the eternity of matter. Thus it will be seen the two highest taqiya or “concealment,” which afterwards became common amongst the Shiʿites, the doctrine, namely, that profession of faith means only the confession of the soul to God, it being allowable that the true believer outwardly conforms to any religion.

Nuwayri also gives the form of contract proposed to a convert at the time of his initiation. This appears in two parts, to each of which the convert gives assent. They may be summarised thus:

(1) A promise before God, and before his Apostle, his prophets, angels, and envoys, to inviolable secrecy as to all the convert knows about the missionary, about the representative of the Imam in the district where he lives, as well as regarding all other members of the sect. A pledge to accept all the orthodox teachings of Islam, and to observe all its rites, both matters which, as we have seen, were required of the lower grades and disregarded by the higher ones.

(2) A pledge to loyalty towards the missionaries and the Imam, and the invocation of the curse of Iblis if this pledge is broken. “If you have any reservation, in will or thought, this oath nevertheless has full binding force upon you, and God will take no satisfaction other than the complete fulfilment of all it contains and of the agreements made between you and me.”

This oath, it will be observed, is intended for those initiated into the first grade, and so conforms to the idea of orthodox Islam, though including the Shiʿite doctrine of an Imam, but covers all that is to be taught later with a veil of secrecy. The plan was to adapt the earlier teaching to the beliefs and capacity of the proselytes, and this method is further illustrated by the kitab as-siyasa or “book of policy,” a manual for the guidance of the duʿat, which Nuwayri describes on the authority of Abu l-Hasan.

According to this the teacher is told to emphasize his zeal for Shiʿite theories if he has to deal with a Shiʿite, to express sympathy with ʿAli and his two sons, and repugnance towards the Arabs who put them to death. If he has to deal with a Sabian, emphasis was laid on the reverence paid to the numeral seven. If his conversation was with a Zoroastrian, his principles are at the basis very similar to those of the Ismaʿilians, and with him the daʿi may commence at the fourth grade. If his business is with a Jew, he should explain that the Mahdi Muhammad b. Ismaʿil is the Messiah expected by the Jews and speak much against the Muslims and Christians, especially about their erroneous beliefs as to the unique birth of Christ, making it plain that Joseph the carpenter was undoubtedly his father. With Christians, on the contrary, it is advised to speak ill of the Muslims and Jews, explaining that the Ismaʿilians recognise the Christian creed, but giving it an allegorical interpretation, and showing that the Paraclete is yet to come, and is the true Imam to whom they are invited to come. In dealing with dualists or Manichaeans the daʿi may begin at the sixth grade of initiation, or if the convert seems worthy of confidence, the whole doctrine may be revealed at once. With one of the “philosophers” who, in true Muslim fashion, are treated as a distinct sect, emphasis is to be laid on the fact that the essential points of the Ismaʿilian faith are based on the teachings of philosophy, and the sect agrees with them in everything concerning the prophets and the eternity of the world; but some of the philosophers differ from the Ismaʿilians in admitting a Being who rules the world, though confessing that he is unknown. With “dualists,” i.e., Muslims of the sect so called (cf. De Sacy: Druses, p. lxviii., note 3), victory is sure; it is only necessary to dwell on the doctrine of the pre-existing and the second. With orthodox Sunnis the missionary is to speak with respect of the early Khalifs, avoid eulogies upon ʿAli and his sons, even mentioning some things about them which call for disapproval: great pains should be taken to secure Sunni adherents as they form most useful defenders. When dealing with a Shiʿite who accepts Musa, the son of Jaʿfar, and his descendants, great care is necessary: the daʿi should dwell on the moral laws of Islam, but explain the sacred associations of the number seven. With some it is impossible to venture further and show that the religion of Muhammad is now abrogated, with others it is possible even to show that the ritual laws of the Qurʾan are obsolete, with a few he may proceed to admit that the Kaʾim is really dead, that he comes back to the world only in a spiritual manner, and explain allegorically the doctrine of the resurrection of the dead. Each is to be dealt with according to his beliefs, and care must be taken not to offend his religious prejudices. The daʿi is advised to study the history of ancient legislators, their adventures, systems and sects, so as to have a fund of illustration which will arrest the attention of their pupils.

Such was the system formed by ʿAbdullah, probably somewhere before A.H. 250, and by him grafted on the already existing sect of Shiʿites, which upheld the claims of Ismaʿil, the son of Jaʿfar. In the reign of Maʾmun (A.H. 198-218) ʿAbdullah had joined the revolt of Ishaq b. Ibrahim at Karkh and Ispahan, and formed a close friendship with the wealthy Muhammad b. Husayn b. Jihan-Bakhtar ad-Didan, a Persian prominent for his intense hatred of the Arabs, and it was he who first supplied ʿAbdullah with funds to begin his propaganda (cf. Quatremère in Journ. Asiat., Aug., 1836). It is not easy to form any clear scheme of the chronology of the sect in its early days, nor to follow the details of its history: conspiracies and secret societies do not leave much in the way of documentary evidence of their first formation. That ʿAbdullah was associated with a rebellion in the reign of Maʾmun is hardly likely; it seems rather that Muhammad b. Husayn ad-Didan (Dandan, or Zaydan) was so associated, and he afterwards befriended ʿAbdullah. This Muhammad was secretary to Ahmad ibn ʿAbdu l-ʿAziz ibn Abi Dolaf, who became prince of Karaj in A.H. 265. No doubt ʿAbdullah was a younger contemporary, assisted by the old anti-Arab agitator. Certainly ʿAbdullah was established at Basra, whither he had removed from Persia, before 261 (Fihrist, 187), lodging there with the family of ʿAgil ibn Abi Talib. Thence he went to Syria, presumably finding suspicion aroused at Basra, and made his headquarters at Salamiya in the territory of Emessa (Maq. i., 348-9: ii., 11), and from there sent out missionaries who preached the claims of Muhammad b. Ismaʿil b. Jaʿfar as the “concealed” Imam, and of ʿAbdullah himself as the Mahdi or “guide,” who was to prepare men for the Imam’s return to earth (Maq. i., 348). At Salamiya he had a son named Ahmad, and when he died Ahmad succeeded him as head of the sect.

Ahmad, like his father, sent out missionaries, and one of these was instrumental in founding the important branch known as the Qarmatians, a branch so important and prominent that some, e.g., Jamal ad-Din, have regarded the Ismaʿilians as their off-shoot. The fact seems to be that there were at first members of one body, then circumstances gave the Qarmatians a political opening in Syria and ʿIraq, and, in a position of independence, they developed their doctrines more openly than the rest of the sect and, being drawn from the peasant class, these assumed a grosser form: whilst the other or parent community found a career in Africa but, as they became there a ruling minority with a subject majority of orthodox type, they were induced to observe some semblance of orthodoxy.

ʿAbdullah was succeeded as head of the Ismaʿilian sect by his son Ahmad. According to the Fihrist he was succeeded first by his son Muhammad, then by a second son Ahmad, the latter being also described as the son of Muhammad, and so grandson of ʿAbdullah (Fihrist, p. 137). This Ahmad may be the one who was at Basra for some time, then at Kufa, whence in 266 or thereabouts he sent missionaries to Yemen; possibly he was the Ahmad al-Qaiyal who wrote a book on the Imamate, which was refuted by Razi (d. 320).