Narrated Ali ibn Abu Talib: The Prophet ﷺ said: If only one day of this time (world) remained, Allah would raise up a man from my family who would fill this earth with justice as it has been filled with oppression.

Narrated Abdullah ibn Masud: The Prophet ﷺ said: If only one day of this world remained. Allah would lengthen that day (according to the version of Zaidah), till He raised up in it a man who belongs to me or to my family whose father's name is the same as my father's, who will fill the earth with equity and justice as it has been filled with oppression and tyranny (according to the version of Fitr). Sufyan's version says: The world will not pass away before the Arabs are ruled by a man of my family whose name will be the same as mine. Abu Dawud said: The version of Umar and Abu Bakr is the same as that of Sufyan.

Narrated Abu Saeed al-Khudri: The Prophet ﷺ said: The Mahdi will be of my stock, and will have a broad forehead a prominent nose. He will fill the earth will equity and justice as it was filled with oppression and tyranny, and he will rule for seven years.