وَأَنَّا لَمَسْنَا السَّمَاءَ فَوَجَدْنَاهَا مُلِئَتْ حَرَسًا شَدِيدًا وَشُهُبًا

Surah Al-Jinn : 8
And we have sought [to reach] the heaven but found it filled with powerful guards and burning flames.

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