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...
English Transliteration
Law yaAAlamu allatheena kafaroo heena la yakuffoona AAan wujoohihimu alnnara wala AAan thuhoorihim wala hum yunsaroona
Tafsir of Verse 39
If the unbelievers but knew when that they shall not ward off the Fire from their faces nor from their backs, neither shall they be helped!
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!