"(Yes,) this is the Day of Judgement you had called a lie."
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : and the angels will say to them: (this is the day of separation) the day of judgement between you and the believers, (which ye used to deny) in the life of this world.
Jalāl al-Dīn al-Maḥallī
تفسير : ‘this is the day of judgement, between [all] creatures, that you used to deny!’