(Al-Mulk) 67 : 17
أَمْ أَمِنْتُمْ مَنْ فِي السَّمَاءِ أَنْ يُرْسِلَ عَلَيْكُمْ حَاصِبًا ۖ فَسَتَعْلَمُونَ كَيْفَ نَذِيرِ
Do you feel secure about the one who is in the Heaven showering stones upon you? Then you will be knowing how the warning was!
It is told in verse 24: 43 that there are mountains of clouds in the sky. So this verse asks the disbelievers of every period that do you feel secure from showering huge ice pieces from the mountains of clouds or any other types of stones upon you. See explanation 29: 40; 48: 24-25; and 54: 34.