وَاِذَا قِيْلَ اِنَّ وَعْدَ اللّٰهِ حَقٌّ وَّالسَّاعَةُ لَا رَيْبَ فِيْهَا قُلْتُمْ مَّا نَدْرِيْ مَا السَّاعَةُۙ اِنْ نَّظُنُّ اِلَّا ظَنًّا وَّمَا نَحْنُ بِمُسْتَيْقِنِيْنَ ( الجاثية: ٣٢ )
Wa izaa qeela inna wa'dallaahi haqqunw was Saa'atu laa raiba feehaa qultum maa nadree mas Saa'atu in nazunnu illaa zannanw wa maa nahnu bimustaiqineen (al-Jāthiyah 45:32)
Sahih International:
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.'" (Al-Jathiyah [45] : 32)
1 Mufti Taqi Usmani
and when it was said to you that Allah’s promise is true and there is no doubt in the (arrival of the) Hour, you used to say, ‘We do not know what the Hour is. We do not think (about it) but as an assumption, and we are not sure.’”