52:44
وَاِنْ یَرَوْا كِسْفًا مِنَ السَّمَٓاءِ سَاقِطًا یَقُولُوا سَحَابٌ مَرْكُومٌ
Wain yaraw kisfan mina alssamai saqitan yaqooloo sahabun markoomun
Translations
And if they were to see a fragment from the sky falling, they would say, "[It is merely] clouds heaped up
Saheeh International
And if they were to see a fragment of the heaven falling, they would say: A heap of clouds
Marmaduke Pickthall