﴿ وَقَالَ ٱلَّذِينَ كَفَرُوا۟ لَا تَأْتِينَا ٱلسَّاعَةُ ۖ قُلْ بَلَىٰ وَرَبِّى لَتَأْتِيَنَّكُمْ عَٰلِمِ ٱلْغَيْبِ ۖ لَا يَعْزُبُ عَنْهُ مِثْقَالُ ذَرَّةٍۢ فِى ٱلسَّمَٰوَٰتِ وَلَا فِى ٱلْأَرْضِ وَلَآ أَصْغَرُ مِن ذَٰلِكَ وَلَآ أَكْبَرُ إِلَّا فِى كِتَٰبٍۢ مُّبِينٍۢ ﴾

“And yet, they who are bent on denying the truth assert, “Never will the Last Hour come upon us!” Say: “Nay, by my Sustainer! By Him who knows all that is beyond the reach of a created being’s perception: it will most certainly come upon you!” Not an atom’s weight [of whatever there is] in the heavens or on earth escapes His knowledge; and neither is there anything smaller than that, or larger, but is recorded in [His] clear decree,”

The addressees of the Quran were not disbelievers in the Day of Judgement. It was just that they did not believe that Judgement Day would bring them humiliation and punishment. The world they lived in appeared safe to them and they could not, therefore, understand how they would be in jeopardy on reaching the world Hereafter. This truth about life and the Universe is found in all divine scriptures. It is the Quran’s mission to reveal this reality in its pure and unadulterated form. Now, those who take a stand in opposition to this mission are indulging in the most improper bravado. Before God, they will be treated as deserving of the severest punishment.