سورة الطور

Ali ibn Ibrahim (may Allah have mercy on him): وَ تَسيرُ الْجِبالُ سَيْراً means the mountains will move like the wind.

Ali ibn Ibrahim (may Allah have mercy on him): Then the Trumpet is blown ... and the sound comes out from the side facing the heavens, so no soul remains in the heavens but that it dies. Allah says: 'O Israfil, die by My leave!' So Israfil dies. And this state lasts as long as Allah wills. Then Allah commands the heavens and they convulse, and He commands the mountains and they move. This is the word of Allah the Exalted: یَوْمَ تَمُورُ السَّماءُ مَوْراً وَ تَسِیرُ الْجِبالُ سَیْراً [The day when the heaven shall be in a violent commotion, and the mountains shall pass away passing away].