21:39 law ya'Ålamul-ladhiyna kafaruu Hiyna laa yakuf-fuuna 'Aw wujuuhihimun naara wa laa 'An Zuhuurihim wa laa hum yunSaruun

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Ahmed Raza Khan: Mohammed Aqib Qadri:
If only the disbelievers realised the time when they will not be able to stop the fire from their faces and from their backs - and nor are they to be helped.

Yusuf Ali:
If only the Unbelievers knew (the time) when they will not be able to ward off the fire from their faces, nor yet from their backs, and (when) no help can reach them!

Pickthal:
If those who disbelieved but knew the time when they will not be able to drive off the fire from their faces and from their backs, and they will not be helped!