أَمْ أَمِنتُم مَّن فِى ٱلسَّمَآءِ أَن يُرْسِلَ عَلَيْكُمْ حَاصِبًا ۖ فَسَتَعْلَمُونَ كَيْفَ نَذِيرِ

Am amintum man fee assama-ian yursila AAalaykum hasiban fasataAAlamoona kayfa natheer

Or do you feel secure that He who is above would not send against you a storm of stones? Then you would know how [severe] was My warning.