﴿ لَوْ يَعْلَمُ ٱلَّذِينَ كَفَرُوا۟ حِينَ لَا يَكُفُّونَ عَن وُجُوهِهِمُ ٱلنَّارَ وَلَا عَن ظُهُورِهِمْ وَلَا هُمْ يُنصَرُونَ ﴾

“If they but knew - they who are bent on deny­ing the truth - [that there will come] a time when they will not be able to ward off the fire from their faces, nor from their backs, and will not find any succour!”

(If those who disbelieved) if those who disbelieved in Muhammad (pbuh) and in the Qur'an knew the chastisement awaiting them, they would not ask for it to be hastened, (but knew the time when they will not be able to drive off) when the chastisement comes, they will not be able to push away (the Fire from their faces and from their backs, and they will not be helped) to drive away the chastisement!