There and then they will be told: "This is the Day of - Surah As-saffat ayat 21 in Tafsir

﴿هَٰذَا يَوۡمُ ٱلۡفَصۡلِ ٱلَّذِي كُنتُم بِهِۦ تُكَذِّبُونَ ﴾
[الصَّافَات: 21]

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

﴿هذا يوم الفصل الذي كنتم به تكذبون﴾ [الصَّافَات: 21]

Dr Kamal Omar
This is the Day of Judgement which you used to deny

Dr Laleh Bakhtiar
This is the Day of Decision which you had been denying

Dr Munir Munshey
(They will hear the reply), "This is the day of the verdict you used to reject

Edward Henry Palmer
this is the day of decision, which ye did call a lie

Farook Malik
It will be said: "Yes, this is the same Day of Judgement which you used to deny

George Sale
this is the day of distinction between the righteous and the wicked, which ye rejected as a falsehood

Maududi
Yes, this is the Day of Final Decision that you used to deny as a lie