The Holy Quran 45:32 — Surah Al-Jathiyah
Arabic text
وَإِذَا قِيلَ إِنَّ وَعْدَ ٱللَّهِ حَقٌّ وَٱلسَّاعَةُ لَا رَيْبَ فِيهَا قُلْتُم مَّا نَدْرِى مَا ٱلسَّاعَةُ إِن نَّظُنُّ إِلَّا ظَنًّا وَمَا نَحْنُ بِمُسْتَيْقِنِينَ
Translation
"When it was said that Allaah's promise is true and that there is no doubt in (the advent of) Qiyaamah, you people used to say, 'We do not know what Qiyaamah is. We merely give it a passing (hasty) thought but have never been convinced (sure) about it."
Tafsir (excerpt) — Tafsir Usmani
Denial of the Day of Resurrection: that is, we do not know what the Day of Resurrection is like. Whatever strange and extraordinary conditions of the Day of Resurrection you describe, we cannot believe them in any way. If, from hearsay, some faint possibility and vague notion occasionally comes to mind, that is another matter.
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