Their 'Mahdi' will come....Mahdi Messianic figure in Islamic eschatology The Mahdi (Arabic:ٱلْمَهْدِيّ, romanized: al-Mahdī, lit. 'the Guided') is a prominent figure in Islamic eschatology who is believed to appear at the End of Time to rid the world of evil and injustice. He is said to be a descendant of Muhammad, who will appear shortly before the Prophets in Islam Jesus and will lead the Muslims to rule the entire world.

The Mahdi is mentioned in several canonical compilations of hadith, but is absent from the Quran and the two most-revered Sunni hadith collections, Sahih al-Bukhari and Sahih Muslim. Thus, some Sunni theologians however have questioned the orthodoxy of the Mahdi. The doctrine of the Mahdi seems to have gained traction during the confusion and unrest of the religious and political upheavals of the first and second centuries of Islam. Among the first references to the Mahdi appear in the late 7th century, when the revolutionary Mukhtar ibn Abi Ubayd (c.622 – 687) declared Muhammad ibn al-Hanafiyya, a son of caliph Ali (r. 656–661), to be the Mahdi. Although the concept of a Mahdi is not an essential doctrine in Islam, it is popular among Muslims. Over centuries, there have been a vast number of Mahdi claimants.

The Mahdi features in both Shi'a and Sunni branches of Islam, though they differ extensively on his attributes and status. Among Twelver Shi'as, the Mahdi is believed to be Imam Muhammad al-Mahdi, twelfth Imam, son of the eleventh Imam, Hasan al-Askari (d. 874), who is said to be in occultation (ghayba) by divine will. This is rejected by most Sunnis, who assert that the Mahdi has not been born yet.