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!

Sahih International
If those who disbelieved but knew the time when they will not avert the Fire from their faces or from their backs and they will not be aided...

Shakir
Had those who disbelieve but known (of the time) when they shall not be able to ward off the fire from their faces nor from their backs, nor shall they be helped.

Pickthall
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!

محمد جالندھری
اے کاش کافر اس وقت کو جانیں جب وہ اپنے مونہوں پر سے (دوزخ کی) آگ کو روک نہ سکیں گے اور نہ اپنی پیٹھوں پر سے اور نہ ان کا کوئی مددگار ہوگا