What do we need to do when the son of Mary descends amongst us and leads us according to the Book of our Lord (hallowed be He and most exalted) and the Sunnah of our Prophet Muhammad (saw)?
 It is narrated on the authority of Abu Huraira that the Messenger of Allah (may peace be upon him) observed:                      What would you do when the son of Mary would descend amongst you and would lead you as one amongst you? Ibn Abi Dhi'b on the authority of Abu Huraira narrated: Your leader amongst you. Ibn Abi Dhi'b said: Do you know what the words:" He would lead as one amongst you" mean? I said: Explain these to me. He said: He would lead you according to the Book of your: Lord (hallowed be He and most exalted) and the Sunnah of your Apostle (may peace be upon him).