"They ask you about the Hour: When will it take place? Say, the science of time belongs to my Lord. He alone will reveal in the term. The secrecy surrounding weighs the inhabitants of the heavens and the earth. It should not surprise you otherwise than unawares. [They ask you] like you were informed! Say Only God knows! but most men are ignorant. "Quran (7, 187).
A Bedouin asked the Messenger of Allah - upon him peace and blessings - "When will the Hour-t place?
Assuming that it is already there, what have you prepared for this moment? replied the Prophet
By God, O Messenger of God, said the Bedouin, I have multiplied neither prayers nor good works, but I love God and His Messenger. - Rejoice, you will be reunited with those you loved! "(Bukhari).