وَجَعَلْنَا السَّمَاءَ سَقْفًا مَّحْفُوظًا ۖ وَهُمْ عَنْ آيَاتِهَا مُعْرِضُونَ (32)
(21:32) And We made the sky a safe canopy, *33 but in spite of this they do not pay due heed to its signs. *34
*33) For explanation, see Al-Hijr (XV): E. N's 8 and 10-12.
*34) That is, "Those signs which are in the sky".