حَتَّىٰٓ إِذَا فَتَحْنَا عَلَيْهِم بَابًا ذَا عَذَابٍ شَدِيدٍ إِذَا هُمْ فِيهِ مُبْلِسُونَ
Hattaaa izaa fatahnaa 'alaihim baaban zaa 'azaabin shadeedin izaa hum feehi mublisoon
Until, when we opened upon them a gate of severe punishment, they were plunged into despair.