 Twelvers, who form the majority of Shi'ites today, believe that Muhammad al Mahdi who is the son of the 11th Imam Al-Hasan al-Askari is in occultation and is the awaited Mahdi.Tayyibi Isma'ili Shi'ites, including the Dawoodi Bohrah, believe that an Imam from the progeny of At-Tayyib Abu'l-Qasim is very much present as the current hidden Imam and Mahdi on earth every time.The term "Mahdi" does not occur in the Quran.