﴿ حَتَّىٰٓ إِذَا فَتَحْنَا عَلَيْهِم بَابًۭا ذَا عَذَابٍۢ شَدِيدٍ إِذَا هُمْ فِيهِ مُبْلِسُونَ ﴾

“until We open before them a gate of [truly] severe suffering [in the life to come]: and then, lo! they will be broken in spirit.”

Please check ayah 23:83 for complete tafsir.