تفسير : (and the day resplendent) and the day when it clears the darkness of night.
Jalāl al-Dīn al-Maḥallī
تفسير : and [by] the day as it unveils, [as] it is revealed and becomes manifest (idhā, ‘as’, in both instances is an absolute adverbial, operated by the verbal action of the oath),
Sahl al-Tustari
تفسير : and [by] the day as it unveils,[it refers to] the spiritual self (nafs al-rūḥ).