Mahdism (Persian: مَهدَویّت,[1] Arabic: المهدوية) in the Twelver branch of Shia Islam, derived from the belief in the reappearance of the Twelfth Shiite Imam, Muhammad al-Mahdi, as the savior of the apocalypse for the salvation of human beings and the establishment of peace and justice. Mahdism is a kind of messianism. From this perspective, it is believed that Jesus Christ and Khidr are still alive and will emerge with Muhammad al-Mahdi in order to fulfil their mission of bringing peace and justice to the world.[2][3][4]