Tafsir of Al-Waqi'ah 56:5

And the mountains will be powdered to dust, meaning, relentlessly pulverized. This was said by Ibn Abbas, Mujahid, Ikrimah and Qatadah and others. Ibn Zayd said: "The mountains will become just like Allah described them,

كثيبا مهيﻼ

A heap of sand poured out. (73:14)'' Allah's saying:

فكانت هباء منبثا