The Day of Judgement, its Pleasures and Hell, and that its Time is not known Allah says,فَإِذَا جَاءتِ الطَّامَّةُ الْكُبْرَىBut 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,وَالسَّاعَةُ أَدْهَى وَأَمَرُّAnd the Hour will be more grievous and more bitter. (54:46)Then Allah says,يَوْمَ يَتَذَكَّرُ الاِْنسَانُ مَا سَعَى