72:8
وَأَنَّا لَمَسْنَا السَّمَاء فَوَجَدْنَاهَا مُلِئَتْ حَرَساً شَدِيداً وَشُهُباً
'And we pried into the secrets of heaven; but we found it filled with stern guards and flaming fires.
72:9
وَأَنَّا كُنَّا نَقْعُدُ مِنْهَا مَقَاعِدَ لِلسَّمْعِ فَمَن يَسْتَمِعِ الْآنَ يَجِدْ لَهُ شِهَاباً رَّصَداً
'We used, indeed, to sit there in (hidden) stations, to (steal) a hearing; but any who listen now will find a flaming fire watching him in ambush.