لَّوْلَآ إِذْ سَمِعْتُمُوهُ ظَنَّ ٱلْمُؤْمِنُونَ وَٱلْمُؤْمِنَـٰتُ بِأَنفُسِهِمْ خَيْرًا وَقَالُوا۟ هَـٰذَآ إِفْكٌ مُّبِينٌ

Why, when you heard it, did not the believing men and believing women think good of themselves [i.e., one another] and say, "This is an obvious falsehood"?

An-Nur 12

وَإِذَا قِيلَ إِنَّ وَعْدَ ٱللَّهِ حَقٌّ وَٱلسَّاعَةُ لَا رَيْبَ فِيهَا قُلْتُم مَّا نَدْرِى مَا ٱلسَّاعَةُ إِن نَّظُنُّ إِلَّا ظَنًّا وَمَا نَحْنُ بِمُسْتَيْقِنِينَ

And when it was said, 'Indeed, the promise of Allāh 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 32