Uthman bin Muhammad · The Promised Deliverer (Kitab Al-Mahdi)

The Prophet (ﷺ) said: If only one day of this world remained. Allah would lengthen that day (according to the version of Za'idah), 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…

The tradition mentioned above has also been transmitted by Umm Salamah from the Prophet (ﷺ) through a different chain of narrators. The tradition of Mu'adh is more perfect.