Quran 21:39 — The Prophets (Al-Anbya')

لَو يَعلَمُ الَّذينَ كَفَروا حينَ لا يَكُفّونَ عَن وُجوهِهِمُ النّارَ وَلا عَن ظُهورِهِم وَلا هُم يُنصَرونَ

If only those who disbelieve could envision themselves when they try to ward off the fire; off their faces and their backs! No one will help them then.

[21:38] They challenge: "Where is that (retribution), if you are truthful?"

[21:40] Indeed, it will come to them suddenly, and they will be utterly stunned. They can neither avoid it, nor can they receive any respite.