They will then be told: "This is what you had denied."
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (and it will be said (unto them)) the keepers of hell will say to them when they enter it: (this is that which ye used to deny) this is the chastisement which you used to claim it will never happen.
Jalāl al-Dīn al-Maḥallī
تفسير : then it will be said, to them: ‘this, that is, the chastisement, is that which you used to deny!’