هَٰذِهِ ٱلنَّارُ ٱلَّتِى كُنتُم بِهَا تُكَذِّبُونَ
This is the Fire which you used to deny.
Roots in this verse: ن و ر (nwr), ك و ن (kwn), ك ذ ب (k*b)