Surah 77. Al-Mursalat, Ayah 13

This is chronologically the earliest occurrence of the expression yawm al-fasl, which invariably relates to the Day of Resurrection (cf. 37:21 , 44:40 , 78:17 , as well as verse {38} of the present surah): an allusion to the oft-repeated Qur'anic statement that on resurrection man will gain a perfect, unfailing insight into himself and the innermost motivation of his past attitudes and doings (cf. 69:1 and the corresponding note [1]).

Cf. xxxvii. 21 and n. 4047; also xliv. 40, and n. 4718. That will be the Day of Judgment or Day of Decision. Good will then be completely separated from Evil. And the men who rejected Truth and flourished on Falsehood will find that in the world of Realities they will be absolutely nowhere. Hence the refrain of this Sura. "Ah woe, that Day, to the Rejecters of Truth!" it sounds like a dirge on Sin.