Surah At-Tur Verse 44

وَإِنْ يَرَوْا كِسْفًا مِنَ السَّمَاءِ سَاقِطًا يَقُولُوا سَحَابٌ مَرْكُومٌ

And if they were to see a fragment from the sky falling, they would say, "[It is merely] clouds heaped up