What is the calamity?

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A day when human bodies will be scattered like moths and consumed by a raging fire.

The Calamity! What is the Calamity? Ah, what will convey unto thee what the Calamity is! ...

A day wherein mankind will be as thickly-scattered moths ...

A bereft and Hungry One will be his mother ...

Raging Fire. Quran 101:1-11