Twelvers(the largest Shi'a group) believe that the Imam Mahdi is the Twelfth Imam, Imam Hujjat Allah, born in 859 on Muhammad's line through 'Ali. Shia Muslims believe Mahdi, a holy leader ImamMahdi (ajtf) says: "Each of my forefathers in his time was compelled by the oath of allegiance to the tyrant ruler and when I reappear, I would not be having the allegiance of any tyrant on my neck. As for how people would benefit from me during my occultation, it is like getting benefits from the sun, which is concealed by the clouds. Theword Shia in Arabic means a group or supportive party of people. The commonly-known term is shortened from the historical Shia't-Ali , or "the Party of Ali." This group is also known as Shiites or followers of Ahl al-Bayt or "People of the Household" (of the Prophet). Within the Sunni and Shia branches, you can also find a number of sects. Interms of the Shia approach, we believe that the person who assumed this responsibility to compile the Holy Quran in book form was none other than Imam Ali ibn Abu Talib (a.s). The 6th Imam of Ahlul Bait (a.s), Imam Jafar Sadiq (a.s), narrates that Rasulullah (SAWA) said the following to Imam Ali (a.s) before departing this world: MaulanaFaizi said, quoting Ayatollah Makarem Shirazi (I think) 313 is a symbolic number. He said Imam will come when the ratio of momins to kafirs to 313 to 1000. From what I read, this will be the exact number of Companions of Imam who will be moved (by their heart) to go the Baitullah in Makkah to see the Imam. TheShia believe that following the words and actions of Imam Ali (a.s) and the other 11 Imams of Ahlul-Bayt (a.s) leads to the actual teachings of the Prophet of Islam. Therefore, when they say they are the Shia of Imam Ali (a.s) they mean they are the followers of Prophet Muhammad (s.a.w.w) through the path of his best student; Imam Ali Thearmy is named after the twelfth Shia imam, "Al Mahdi," who disappeared at the end of the 9 th century. Upon his return, Shias believe he will restore justice and truth on Earth. The BriefAnswer. Those who do not believe in Islam can be classified into two groups: 1. Those who are termed ' Jahil-e-Muqassir ' (lit. ' culpable ignorant '). These are non-believers to whom the message of Islam has reached and who have understood its truthfulness. Also they do not believe that the Imam is the most knowledgeable man. 3.We believe that the Imam is chosen by Allah. But Sunnis believe that he can be chosen by one person, or a group of Muslims. Some Sunnis believe that an Imam (ruler) can take the power by forcing and killing, too. Anothergroup of historians studying the pedigrees of some Central Asian saints' shejere (genealogy trees) believe that the Twelfth Imam was not the only son of Hasan al-Askari, and that the Eleventh Imam had two sons: Sayyid Muhammad (i.e., the Shia Mahdi) and Sayyid Ali Akbar. rxfi.