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For this sarcastic demand of the unbelievers, see 6:57 and 8:32 , as well as the corresponding notes; also verse {187} of the present surah.
While some sinners out of negligence postpone the day of repentance till it is too late, others more bold actually ask out of bravado that Allah's Punishment should be brought down on them at once, as they do not believe in Allah or His Punishment! The answer to them is: It will come soon enough-too soon, they will think, when it comes! Cf. xxii. 47 and notes.