Surah Al-Waqi'ah 56:5
وَبُسَّتِ ٱلْجِبَالُ بَسًّا
And the mountains are broken down, crumbling
Translation: Saheeh International
Tafsir
and the mountains are pulverised to tiny pieces
Excerpt from Tafsir al-Jalalayn, commentary on 56:5, via Quran.com. The reader has the full commentary and 9 more tafsirs.