Imam al-Mahdi in Sunni Ḥadith-Books Due to the widely related and authentic traditions narrated from the Prophet Muhammad, all Islamic scholars are unanimous on the belief that Imam Mahdi shall indeed appear, reform the world and destroy all oppression. Hence, there is no difference of opinion in Mahdism; all Muslims have faith in it and consider it an inseparable part of their religious belief. All Shiˈa scholars, without any exception, believe …