The Shi'a Twelvers
The period of occultation (ghaybat) is divided into two parts:
- Ghaybat al-Sughra or Minor Occultation (874–941), consists of the first few decades after the Imam's disappearance when communication with him was maintained through deputies of the Imam.
- Ghaybat al-Kubra or Major Occultation began 941 and is believed to continue until a time decided by God, when the Mahdi will reappear to bring absolute justice to the world.
During the Minor Occultation (Ghaybat al-Sughra), it is believed that al-Mahdi maintained contact with his followers via deputies (Arab. an-nuwāb al-arbaʻa literal: the four leaders). They represented him and acted as agents between him and his followers.
Whenever the believers faced a problem, they would write their concerns and send them to his deputy. The deputy would ascertain his verdict, endorse it with his seal and signature and return it to the relevant parties. The deputies also collected zakat and khums on his behalf. For the Shia, the idea of consulting a hidden Imam was not something new because the two prior Shia Imams had, on occasion, met with their followers from behind a curtain. Also, during the oppressive rule of the later Abbasid caliphs, the Shia Imams were heavily persecuted and held prisoners, thus their followers were forced to consult their Imams via messengers or secretly.
Shia Tradition hold that four deputies acted in succession to one another:
- Uthman ibn Sa’id al-Asadi
- Abu Jafar Muhammad ibn Uthman
- Abul Qasim Husayn ibn Ruh al-Nawbakhti
- Abul Hasan Ali ibn Muhammad al-Samarri
In 941 (329 AH), the fourth deputy announced an order by al-Mahdi, that the deputy would soon die and that the deputyship would end and the period of the Major Occultation would begin.
The fourth deputy died six days later and the Shi'a Muslims continue to await the reappearance of the Mahdi. In the same year, many notable Shi'a scholars such as Ali ibn Babwayh Qummi and Muhammad ibn Yaqub Kulayni, the learned compiler of al-Kafi also died.
According to the last letter of al-Mahdi to Ali ibn Muhammad al-Samarri "from the day of your death the period of my major occultation (al ghaybatul kubra) will begin. Henceforth no one will see me unless and until Allah makes me appear." Another view is that the Hidden Imam is on earth "among the body of the Shia" but "incognito." "Numerous stories" exist of the Hidden Imam "manifesting himself to prominent members of the ulama."
Read more about this topic: Imamah (Shi'a Doctrine)