Tafsir of An-Nazi'at 79:34

The Day of Judgement, its Pleasures and Hell, and that its Time is not known Allah says,

فٳذا جاءت الطامة الكبرى

But when there comes the Great Catastrophe, This refers to the Day of Judgement. This has been said by Ibn Abbas. It has been called this because it will overcome every matter. It will be frightful and horrifying. As Allah says,

والساعة أدهى وأمر

And the Hour will be more grievous and more bitter. (54:46) Then Allah says,

يوم يتذكر اﻻنسان ما سعى