هَٰذَا يَوْمُ ٱلْفَصْلِ ٱلَّذِى كُنتُم بِهِۦ تُكَذِّبُونَ
This is the Day of Separation which you used to deny.
Roots in this verse: ي و م (ywm), ف ص ل (fSl), ك و ن (kwn), ك ذ ب (k*b)