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I.e., the end of their own life, which must precede their resurrection.
The Unbelievers-or even men of half-hearted faith-may say, "Why worry over distant future events? Take the day as it comes!" But that is a fallacy. Judgment is certain, and it may be that this very hour may be the hour of doom for any given individual. This is the hour of repentance and amendment. For Allah wishes well to all mankind in spite of their ingratitude.