﴿ قَالُوا۟ لَبِثْنَا يَوْمًا أَوْ بَعْضَ يَوْمٍۢ فَسْـَٔلِ ٱلْعَآدِّينَ ﴾

“They will answer: ‘We have spent there a day, or part of a day; but ask those who [are able to] count [time] …””

(They will say: We tarried but a day) upon saying this, they will have some doubt, and therefore will say: (or part of a day). Then, they said: we do not know: (Ask of those who keep count!) i.e. the angels who record people's deeds; it is also said that this refers to the angel of death and his helpers.