An-Naml - 27:88

وَتَرَى الْجِبَالَ تَحْسَبُهَا جَامِدَةً وَهِيَ تَمُرُّ مَرَّ السَّحَابِ صُنْعَ اللَّهِ الَّذِي أَتْقَنَ كُلَّ شَيْءٍ إِنَّهُ خَبِيرٌ بِمَا تَفْعَلُونَ
[27:88]
And you see the mountains, you think them to be solid, and they shall pass away as the passing away of the cloud-- the handiwork of Allah Who has made every thing thoroughly; surely He is Aware of what you do.
Thou seest the mountains and thinkest them firmly fixed: but they shall pass away as the clouds pass away: (such is) the artistry of Allah, who disposes of all things in perfect order: for he is well acquainted with all that ye do.
And thou seest the hills thou deemest solid flying with the flight of clouds: the doing of Allah Who perfecteth all things. Lo! He is Informed of what ye do.