وَأَنَّا لَمَسْنَا السَّمَاء فَوَجَدْنَاهَا مُلِئَتْ حَرَسًا شَدِيدًا وَشُهُبًا
[72:8]
And that we sought to reach heaven, but we found it filled with strong guards and flaming stars.
'And we pried into the secrets of heaven; but we found it filled with stern guards and flaming fires.
And (the Jinn who had listened to the Qur'an said): We had sought the heaven but had found it filled with strong warders and meteors.