The Noble Qur'an in several chapters has announced this and hundreds of prophetic traditions have related the world's adoption of Islam and the government of justice and establishment of complete security in the land after the reappearance of the promised Mahdi (may Allah hasten his return) who is from the descendents of Ali and Fatimah (peace be upon her) and shares the name and agnomen (kunya) of the prophet (peace be upon him and his family).
Na vilevile Mheshimiwa sayyid alikuwa katika masomo yake ni kama hakimu ambaye hubeba pamoja nae mafaili maalum ya kila kesi, kwa hivyo katika kila mas’ala kati ya mas’ala ya Fiqhi akihifadhi faili lake maalum katika kifua chake, na faili hilo likikusanya au likiwa na riwaya mbali mbali za mas’ala hiyo na kauli mbali mbali za maulamaa wa kisunni (Al-aamah) na kishia (Al-khaaswa) kwenye faili hilo, na rai zao zenye kutofautiana kuhusiana na mas’ala hiyo na kuhusiana na riwaya hiyo moja, na baadae huyabainisha mas’ala hayo yaliyo tajwa kwa uwazi kabisa na mwisho kumalizia kwa kutoa rai yake kuhusu mas’ala hiyo.