(… هَٰذَا يَوْمُ الْفَصْلِ) (This is the Day of Judgement …): This is the Day that Allah (swt) has appointed it for the Resurrection, Gathering and Account. This is the Day when the disbelievers will be recompensed for their disbelief and denial of Allah’s Messengers and Books. This is the Day that Allah (swt) says about:

 إِذَا الرُّسُلُ أُقِّتَتْ (11) لِأَيِّ يَوْمٍ أُجِّلَتْ (12) لِيَوْمِ الْفَصْلِ

(And when the messengers’ time has come..(11) For what Day was it postponed? (12) For the Day of Judgement.) (Al-Mursalat: 11-13)

(  وَالْأَوَّلِينَ… ) (…the former peoples): The disbelievers will be gathered along with the former old generations. No one will be absent, all of them will be there. Allah’s promise, which the disbelievers used to deny and escape from, will truly come.