Surah At-Tur, Verse 44

وَإِن يَرَوۡاْ كِسۡفٗا مِّنَ ٱلسَّمَآءِ سَاقِطٗا يَقُولُواْ سَحَابٞ مَّرۡكُومٞ٤٤

wa-in yaraw kis'fan mina l-samāi sāqiṭan yaqūlū saḥābun markūmun

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