بَعْدَ مَعْرِفَتِهِمْ وَإِقْرَارِهِمْ بِأَلْسِنَتِهِمْ أَنَّ كَثِيرًا مِمَّا يَقْذِفُونَ بِهِ إِلَى الْأَغْبِيَاءِ مِنَ النَّاسِ هُوَ مُسْتَنْكَرٌ، وَمَنْقُولٌ عَنْ قَوْمٍ غَيْرِ مَرْضِيِّينَ
Translation: They knew and admitted that much of what they cast toward uninformed audiences was objectionable and came through people not approved as reliable transmitters.
“After their knowledge and their acknowledgement with their own tongues” is central: these transmitters knew and admitted the defects. Muslim criticizes their uncritical circulation of such reports among people unable to recognize those defects. Specialists’ citation of the same reports for careful investigation and criticism is a distinct activity.