Sayyiduna Ubadah bin Samit (may Allah be pleased with him) narrates that a man came to the service of the Noble Prophet (peace and blessings be upon him) and said: O Messenger of Allah! How long will the prosperity of your Ummah last? The Prophet (peace and blessings be upon him) did not answer him, and the man repeated this question three times, yet the Prophet (peace and blessings be upon him) did not answer. The man left. Later, the Noble Prophet (peace and blessings be upon him) inquired: Where is that questioner? The companions called him back. The Prophet (peace and blessings be upon him) said: You have asked me about something that no one from my Ummah has ever asked me before. The fact is that the period of prosperity for my Ummah is one hundred years. The Prophet (peace and blessings be upon him) repeated this statement two or three times. The man said: O Messenger of Allah! Is there any sign of this? The Prophet (peace and blessings be upon him) said: Yes, the earth swallowing people, earthquakes occurring, and devils being unleashed, who will gather from all sides against the people.