At-Toor - 44

﴿وَإِنْ يَرَوْا كِسْفًا مِنَ السَّمَاءِ سَاقِطًا يَقُولُوا سَحَابٌ مَرْكُومٌ﴾

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44. And if they were to see a piece of the heaven falling down, they would say: "Clouds gathered in heaps!"