﴿ يَوْمَ يَقُومُ ٱلنَّاسُ لِرَبِّ ٱلْعَٰلَمِينَ ﴾

“the Day when all men shall stand before the Sustainer of all the worlds?”

a day when yawma is a substitution for the syntactical locus of li-yawmin ‘to an awful day’ and as such is in the accusative because of the verb mab‘ūthūna ‘will be resurrected’ mankind will rise from their graves before the Lord of the Worlds? the Lord of all creatures for His affair His reckoning and His requital.