الطور — At-Tur Ayat 44
وَاِنْ يَّرَوْا كِسْفًا مِّنَ السَّمَاۤءِ سَاقِطًا يَّقُوْلُوْا سَحَابٌ مَّرْكُوْمٌ
Wa iy yarau kisfam minas-samā'i sāqiṭay yaqūlū saḥābum markūm(un).
"And if they were to see a fragment from the sky falling, they would say, "[It is merely] clouds heaped up.""