لَوْلَآ اِذْ سَمِعْتُمُوْهُ ظَنَّ الْمُؤْمِنُوْنَ وَالْمُؤْمِنٰتُ بِاَنْفُسِهِمْ خَيْرًاۙ وَّقَالُوْا هٰذَآ اِفْكٌ مُّبِيْنٌ ( النور: ١٢ )
Law laaa iz sami'tumoohu zannal mu'minoona walmu'minaatu bi anfusihim khairanw wa qaaloo haazaaa ifkum mmubeen (an-Nūr 24:12)
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)
1 Mufti Taqi Usmani
Why - when you (O believers) heard of it - did the believing men and the believing women not think well about their own selves, and (why did they not) say, “This is a manifest lie”.