Surah Al-Ma'arij 70:9

The Ascending Stairways · Verse 9 of 44 · Juz 29 · Page 568

وَتَكُونُ ٱلْجِبَالُ كَٱلْعِهْنِ

And the mountains will be like wool,

Translation: Saheeh International

Tafsir

and the mountains will be as flakes of wool in terms of their lightness and their floating about in the wind.

Excerpt from Tafsir al-Jalalayn, commentary on 70:9, via Quran.com. The reader has the full commentary and 9 more tafsirs.