Surah Al-Jinn, Verse 8

وَأَنَّا لَمَسۡنَا ٱلسَّمَآءَ فَوَجَدۡنَٰهَا مُلِئَتۡ حَرَسٗا شَدِيدٗا وَشُهُبٗا٨

wa-annā lamasnā l-samāa fawajadnāhā muli-at ḥarasan shadīdan washuhuban

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