وَلا يَزالُ الَّذينَ كَفَروا في مِريَةٍ مِنهُ حَتّىٰ تَأتِيَهُمُ السّاعَةُ بَغتَةً أَو يَأتِيَهُم عَذابُ يَومٍ عَقيمٍ

But the unbelievers will remain in doubt until the Hour suddenly overtakes them—or the punishment of a barren day befalls them.