An-Naml 27:88
وَتَرَى ٱلْجِبَالَ تَحْسَبُهَا جَامِدَةً وَهِىَ تَمُرُّ مَرَّ ٱلسَّحَابِ ۚ صُنْعَ ٱللَّهِ ٱلَّذِىٓ أَتْقَنَ كُلَّ شَىْءٍ ۚ إِنَّهُۥ خَبِيرٌۢ بِمَا تَفْعَلُونَ
Watara aljibala tahsabuhajamidatan wahiya tamurru marra assahabi sunAAaAllahi allathee atqana kulla shay-in innahukhabeerun bima tafAAaloon
"And you see the mountains, thinking them motionless, while they will pass as the passing of clouds. [It is] the work of Allāh, who perfected all things. Indeed, He is Aware of that which you do."
An-Naml 27:88, translation by Sahih International
A short reflection
You see the mountains, thinking them firmly fixed, while they are passing as the passing of clouds.