Signs of Imam Mahdi Arrival
In Islamic eschatology, the Mahdi is the prophesied redeemer of Islam who will rule for seven, nine, or nineteen years (according to differing interpretations)before the Day of Judgment (yawm al-qiyamah / literally, the Day of Resurrection) and will rid the world of evil.
There is no explicit reference to the Mahdi in the Qu'ran, but references to him are found in hadith (the reports and traditions of Muhammad's teachings collected after his death). According to Islamic tradition, the Mahdi's tenure will coincide with the Second Coming of Jesus Christ (Isa), who is to assist the Mahdi against the Masih ad-Dajjal (literally, the "false Messiah" or Antichrist). Differences exist in the concept of the Mahdi between Sunni Muslims and adherents of the Shia tradition. For Sunnis, the Mahdi is Muhammad's successor who is yet to come. For most Shia Muslims, the Mahdi was born but disappeared and will remain hidden from humanity until he reappears to bring justice to the world, a doctrine known as the Occultation. For Twelver Shia, this "hidden Imam" is Muhammad al-Mahdi, the Twelfth Imam.