أَفَلَم يَرَوا إِلىٰ ما بَينَ أَيديهِم وَما خَلفَهُم مِنَ السَّماءِ وَالأَرضِ ۚ إِن نَشَأ نَخسِف بِهِمُ الأَرضَ أَو نُسقِط عَلَيهِم كِسَفًا مِنَ السَّماءِ ۚ إِنَّ في ذٰلِكَ لَآيَةً لِكُلِّ عَبدٍ مُنيبٍ

Then, do they not look at what is before them and what is behind them of the heaven and earth? If We should will, We could cause the earth to swallow them or [could] let fall upon them fragments from the sky. Indeed in that is a sign for every servant turning back [to Allah].