حَتَّىٰٓ إِذَا فَتَحۡنَا عَلَيۡهِم بَابٗا ذَا عَذَابٖ شَدِيدٍ إِذَا هُمۡ فِيهِ مُبۡلِسُونَ
Hatta itha fatahna AAalayhim baban tha AAathabin shadeedin itha hum feehi mublisoona
Until We open on them a gate leading to a severe Punishment: then Lo! they will be plunged in despair therein!