Sayyiduna Abu Sa'id (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "In the last era of my Ummah, the Mahdi will appear. Allah Almighty will send down rain, the earth will produce crops, he will bestow abundant wealth upon the people, livestock will increase, the number of the Ummah will grow, and he will live for seven or eight years."