"This is that which you used to deny" [83:17] in the worldly life. That is said to the polytheists while they are in the Fire. Interpretation of Surah al-Mutaffifin from verse 18 to 36.
﴿هَذَا الَّذِي كُنْتُمْ بِهِ تُكَذِّبُونَ﴾ فِي الدُّنْيَا يُقَالُ ذَلِكَ لِلمْشُرْكِينَ وهم فِي النَّار. تَفْسِير سُورَة المطففين من آيَة ١٨ - ٣٦.