37:21

هَٰذَا يَوْمُ الْفَصْلِ الَّذِي كُنتُم بِهِ تُكَذِّبُونَ

Transliteration:

Hatha yawmu alfasli allathee kuntum bihi tukaththiboona

Word by Word:

"This (is the) Day (of) Judgment which you used to [of it] deny."

Translations:

[And they will be told:] This is the Day of Distinction [between the true and the false - the Day] which you were wont to call a lie!"

(A voice will say,) "This is the Day of Sorting Out, whose truth ye (once) denied!"

This is the Day of Separation, which ye used to deny.

This is the day of Judgment, which you called a lie.

[They will be told], "This is the Day of Judgement which you used to deny."