وقيل صدق الخبر مطابقته لاعتقاد المخبر، ولو كان ذلك الاعتقاد خطأ غير مطابق للواقع
Another view defines truth as agreement with the speaker’s belief, even if the belief is mistaken and conflicts with reality.
This position is associated with al-Naẓẓām. Its test concerns the relation between the utterance and the speaker’s actual belief, rather than between the utterance and the external fact. Thus a sincerely reported but mistaken belief can count as true on this technical definition.
This is a historical position in the source, not an assertion that the belief thereby becomes objectively correct.