Re: THE TRUE MEHDI
this is very interesting
"There will be disagreement at the death of a Khilafah, so a man from Madinah will come out fleeing to Makkah, and the people of Makkah will come to him and bring him out (as a claimant for the Khilafah) against his will and swear allegiance to him between the Corner (of the Ka'bah in which the black stone is) and the station (of Ibrahim). An expeditionary force will be sent against him from Sham (Syria) and the earth will swallow them up in the waterless desert between Makkah and Madinah. When people see that, the Abdal of the people of Sham will come to him and the companies of the people of Iraq and they will swear allegiance to him. Then a man of Quraysh will arise (in rebellion) whose maternal uncles are (the tribe of) Kalb, and an expeditionary force will be sent against them and they will conquer them, and that is the expeditionary force of Kalb, and there is disappointment for whoever does not attend (the division of) the spoils of Kalb. So he will divide up the wealth, and he will act among people according to their Prophet's Sunnah and he will throw Islam by its neck on the earth. He will remain seven years then die and the Muslims will pray over him" [Abu Dawud Book 36, Number 427]
The hadith on Imam Mahdi show us a number of things. He will be one of the Muslims from this Ummah, with some hadith indicating he will be a descendent of Muhammad (salAllahu alaihi wasallam). He will not carry out any miracles or receive any revelation but will rule with justice which will bring prosperity for the Khilafah state. He will not know that he is the Mahdi, as the hadith indicates that he will be reluctant to take the allegiance (bay'ah), and he will need to be convinced to take it. The Hadith explicitly states that he will follow the death of a Khaleefah, and there will be a dispute about the next one. The Ummah will be debating who to give bay'ah to, and they will give it to him. All this indicates that the Ummah will have a Khilafah state, and that they will know how to appoint a Khaleefah.
These points also indicate that the Mahdi will learn Islam from around them, as he will receive no revelation. The hadith states what he will act among the people according to the Sunnah which again indicates that it is the Ummah which will have to be ready to teach and groom the Mahdi to take up the tasks of Khaleefah.
Therefore there is no indication for some Muslims to remain inactive and do nothing; certain event must pass before his arrival such as the re-establishment of Khilafah state, and the preparation of the Ummah to resume the Islamic way of life. This obligation still lies upon the Muslims and not upon Imam Mahdi.