26:201
لَا يُؤْمِنُونَ بِهِ حَتَّىٰ يَرَوُا الْعَذَابَ الْأَلِيمَ
Transliteration:
La yu/minoona bihi hatta yarawoo alAAathaba al-aleema
Word by Word:
Not they will believe in it until they see the punishment [the] painful.
Translations:
they will not believe in it till they behold the grievous suffering
They will not believe in it until they see the grievous Penalty;
They will not believe in it till they behold the painful doom,
They will not believe in it till they see the painful chastisement:
They will not believe in it until they see the painful punishment.