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The Surah that follows Surah Mursalat is An-Naba’. In this Surah, al-Mursalat, one Ayat is repeated ten times, وَيْلٌ يَوْمَئِذٍ لِلْمُكَذِّبِينَ "Woe, that Day, to the deniers.". In this surah (Naba) it seems as though Allah is responding to the deniers of the Day of Judgment, by saying in this Surah, كَلَّا سَيَعْلَمُونَ "No! They will come to know." They will know the reality of what they where lying about. This in response to the Ayat that is being repeated in Surah Mursalat.
Also in Surah Mursalat Allah says وَمَا أَدْرَاكَ مَا يَوْمُ الْفَصْلِ "And what can make you know what is the Day of FASL (separation)?" but Allah does not tell us what this Day of FASL (separation) is and rather answers this question in Surah Naba’ إِنَّ يَوْمَ الْفَصْلِ كَانَ مِيقَاتًا "Indeed, the Day of FASL is an appointed time."
In Surah Mursalat, we (mentioned) find two groups of people. One group is the people of Taqwa إِنَّ الْمُتَّقِينَ فِي ظِلَالٍ وَعُيُونٍ the other are the مُكَذِّبِينَ the deniers. And we find the same two groups in Surah An-Naba.
It is as if Surah An-Naba is explaining in detail what was mentioned in Surah Mursalat.