(An-Naml) 27 : 88
وَتَرَى الْجِبَالَ تَحْسَبُهَا جَامِدَةً وَهِيَ تَمُرُّ مَرَّ السَّحَابِ ۚ صُنْعَ اللَّهِ الَّذِي أَتْقَنَ كُلَّ شَيْءٍ ۚ إِنَّهُ خَبِيرٌ بِمَا تَفْعَلُونَ
And you see the mountains, thinking them as motionless, that Day they will move like clouds. It is the work of Lord Allah Who perfected everything; indeed, He is acquainted with what they are doing.
It is told in verse 101: 4-5: “On the Doomsday people will be like dispersed moths and the mountains will be like carded wool”. See explanation 14: 48.