Al-Jathiyah 45:32

وَإِذَا قِيلَ إِنَّ وَعۡدَ ٱللَّهِ حَقࣱّ وَٱلسَّاعَةُ لَا رَيۡبَ فِيهَا قُلۡتُم مَّا نَدۡرِي مَا ٱلسَّاعَةُ إِن نَّظُنُّ إِلَّا ظَنࣰّ ا وَمَا نَحۡنُ بِمُسۡتَيۡقِنِينَ۝٣٢

32. And when it was said, 'Indeed, the promise of Allah is truth and the Hour [is coming] - no doubt about it,' you said, 'We know not what is the Hour. We assume only assumption, and we are not convinced