وَكَذَلِكَ مَنِ الْغَالِبُ عَلَى حَدِيثِهِ الْمُنْكَرُ أَوِ الْغَلَطُ أَمْسَكْنَا أَيْضًا عَنْ حَدِيثِهِمْ
Translation: Likewise, where anomalous reports or errors predominate in a transmitter’s narrations, we also refrain from transmitting their reports.
This is a separate basis from an accusation of deliberate fabrication. Even absent intentional dishonesty, a narrator whose transmission is habitually unreliable cannot supply the dependable material sought for the collection. Neither category should be confused with a generally precise narrator’s occasional mistake.
Al-Nawawī also rejects the exceptional claim that fabricating reports for exhortation or warning is permissible. The Prophetic prohibition against deliberately attributing falsehood to him is general; a pious intention does not authorize fabrication.