The Book Pertaining to the Turmoil and Portents of the Last Hour (Kitab Al-Fitan wa Ashrat As-Sa`ah)
Muslim :: Book 41 : Hadith 6955
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: The day and the night would not come to an end before a man called al-Jahjah would occupy the throne.