Al-Muzzammil • BN-TAFSEER-IBN-E-KASEER
﴿ يَوْمَ تَرْجُفُ ٱلْأَرْضُ وَٱلْجِبَالُ وَكَانَتِ ٱلْجِبَالُ كَثِيبًۭا مَّهِيلًا ﴾
“on the Day when the earth and the mountains will be convulsed and the mountains will [crumble and] become like a sand-dune on the move!”
Please check ayah 73:18 for complete tafsir.