Surah An Nahl Tafseer

أَلَمْ يَرَوْاْ إِلَى الطَّيْرِ مُسَخَّرَاتٍ فِي جَوِّ السَّمَاء مَا يُمْسِكُهُنَّ إِلاَّ اللّهُ

Do they not see the birds held (flying) in the midst of the sky! None holds them up but Allah.

Then Allah tells His servants to look at the birds held (flying) in the sky, between heaven and earth, and how He has caused them to fly with their wings in the sky. They are held up only by Him, it is He Who gave them the strength to do that, subjecting the air to carry them and support them. As Allah says in Surah Al-Mulk:

أَوَلَمْ يَرَوْا إِلَى الطَّيْرِ فَوْقَهُمْ صَــفَّـتٍ وَيَقْبِضْنَ مَا يُمْسِكُهُنَّ إِلاَّ الرَّحْمَـنُ إِنَّهُ بِكُلِّ شَىْءٍ بَصِيرٌ

Do they not see the birds above them, spreading their wings out and folding them in None holds them up except the Most Gracious (Allah). Verily, He is the All-Seer of everything. (67:19)

And here Allah says:

إِنَّ فِي ذَلِكَ لَايَاتٍ لِّقَوْمٍ يُوْمِنُونَ

Verily, in this are clear signs for people who believe