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

But those who disbelieve will not cease to be in doubt of it until the Hour comes upon them unexpectedly or there comes to them the punishment of a barren Day.