189فَكَذَّبوهُ فَأَخَذَهُم عَذابُ يَومِ الظُّلَّةِ ۚ إِنَّهُ كانَ عَذابَ يَومٍ عَظيمٍ(Irfan-ul-Quran)So they rejected Shu‘aib and the torment of the Day of Shadow seized them. No doubt that was the torment of a terrible day.