Tafsir of Al-Mursalat 77:15

For what Day are these signs postponed? For the Day of Sorting Out. And what will explain to you what is the Day of Sorting Out? Woe that Day to the deniers! Allah is saying, `for which day are the Messengers postponed and their matter expected, so that the Hour will be established.' This is as Allah says,

فﻼ تحسبن الله مخلف وعده رسله إن الله عزيز ذو انتقام

يوم تبدل اﻻرض غير اﻻرض والسموت وبرزوا لله الواحد القهار

So think not that Allah will fail to keep His promise to His Messengers. Certainly, Allah is Almighty, All-Able of Retribution. On the Day when the earth will be changed to another earth and so will be the heavens, and they will appear before Allah, the One, the Irresistible. (14:47, 48) This is the Day of Sorting Out, as Allah says,

ليوم الفصل

the Day of Sorting Out. Then Allah says, in magnifying its matter,

وما أدراك ما يوم الفصل

ويل يوميذ للمكذبين

And what will explain to you what is the Day of Sorting Out? Woe that Day to the deniers. meaning, woe unto them from Allah's torment that is coming in the future