It is narrated from Hazrat Abu Saeed Khudri that the Messenger of Allah, peace and blessings be upon him, said: There will be a Mahdi in my Ummah. Whether his age is long or short, he will rule over the earth for seven years, or eight years, or nine years. Then he will fill the earth with justice and fairness just as it had been filled with oppression. And then rain will descend from the sky and the earth will bring forth its blessings. The Prophet, peace and blessings be upon him, said: My Ummah will live a life in his time such as it has never lived before.