أَم أَمِنتُم مَن فِي السَّماءِ أَن يُرسِلَ عَلَيكُم حاصِبًا ۖ فَسَتَعلَمونَ كَيفَ نَذيرِ

Or do you feel secure that He who [holds authority] in the heaven would not send against you a storm of stones? Then you would know how [severe] was My warning.