Surah Al-Anbiya' (The Prophets), Verse 39

لَوْ یَعْلَمُ الَّذِیْنَ كَفَرُوْا حِیْنَ لَا یَكُفُّوْنَ عَنْ وُّجُوْهِهِمُ النَّارَ وَلَا عَنْ ظُهُوْرِهِمْ وَلَا هُمْ یُنْصَرُوْنَ ۟

Law ya'lamul lazeena kafaroo heena laa yakuffoona 'anw wujoohihimun Naara wa laa 'an zuhoorihim wa laa hum yunsaroon

“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!”

Quran 21:39 (Yusuf Ali Translation)