[They will be told], "This is the Day of Judgement which you (37:21)

Almuntakhab Fi Tafsir Alquran Alkarim

There and then they will be told: This is the Day of Judgement and final decision, the Day on which the faithful are segregated from the infidels, this is the Day you have always denied

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(37:21) 'Yes, this is the Day of Final Decision that you used to deny as a lie.' *13

[They will be told], "This is the Day of Judgement which you meaning

*13) It may be that this is said by the believers, or by the angels; or it may be, as it were, the common expression of the conditions prevailing in the plain of Resurrection or it may as well be another reaction of the people themselves. That is, they may be saying in their hearts. "In the world, you lived in a way as if no Day of Judgement would ever come. Now you have come to your doom! This is the same Day that you used to deny ! "
 

[They will be told], "This is the Day of Judgement which you meaning in Urdu

"یہ وہی فیصلے کا دن ہے جسے تم جھٹلایا کرتے تھے"