الجن — Al-Jinn Ayat 8

وَّاَنَّا لَمَسْنَا السَّمَاۤءَ فَوَجَدْنٰهَا مُلِئَتْ حَرَسًا شَدِيْدًا وَّشُهُبًاۖ

Wa annā lamasnas-samā'a fa wajadnāhā muli'at ḥarasan syadīdaw wa syuhubā(n).

"And we have sought [to reach] the heaven but found it filled with powerful guards and burning flames."