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He directs the command from the heaven to the earth, for the duration of this world, then it ascends, then the command and the direction [thereof] returns, to Him in a day whose measure is a thousand years by your reckoning, in this world. In sūrat sa'ala, [An asker] asked [the measure is said to be]: 'fifty thousand years' [Q. 70:4] - and this [day] is the Day of Resurrection, [reckoned so] because of the severity of its terrors for the disbeliever. As for the believer, however, for him it will be easier than performing any one of [his] obligatory prayers in this world - as is stated in hadīth.