﴿ وَإِذَا قِيلَ إِنَّ وَعْدَ ٱللَّهِ حَقٌّۭ وَٱلسَّاعَةُ لَا رَيْبَ فِيهَا قُلْتُم مَّا نَدْرِى مَا ٱلسَّاعَةُ إِن نَّظُنُّ إِلَّا ظَنًّۭا وَمَا نَحْنُ بِمُسْتَيْقِنِينَ ﴾

“for when it was said, ‘Behold, God’s promise always comes true, and there can be no doubt about [the coming of] the Last Hour’ - you would answer, ‘We do not know what that Last Hour may be: we think it is no more than an empty guess, and [so] we are by no means convinced!’””

And when it was said to you O disbelievers “God’s promise of resurrection is indeed true and there is no doubt about the Hour” read al-sā‘atu or al-sā‘ata you said “We do not know what the Hour is. We only make conjectures al-Mubarrad said that this actually means in nahnu illā nazunnu zannan and we are by no means certain” ’ that it will come to pass.