﴿ كَلَّآ إِنَّهُمْ عَن رَّبِّهِمْ يَوْمَئِذٍۢ لَّمَحْجُوبُونَ ﴾

“Nay, verily, from [the grace of] their Sustainer shall they on that Day be debarred;”

Literally ‘A prison’. It means a certain place in which the record of the deeds of the wicked is preserved.