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

Lawla ith samiAAtumoohu thannaalmu/minoona walmu/minatu bi-anfusihim khayran waqaloohatha ifkun mubeen

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"?