أَمَّا عَمْدًا فَبِالْإِجْمَاعِ، وَأَمَّا سَهْوًا فَعِنْدَ الْأَكْثَرِينَ
Intentional falsehood is excluded by consensus; the question of inadvertence is treated by the majority.
Intention means consciously choosing an act; inadvertence lacks deliberate violation. Scholars have discussed whether or how an accidental mistake could occur in a particular act of transmission and be corrected. This is not a debate over permitting deliberate deception in revelation.
The central purpose is the preservation of the authentic prophetic message. Considering a hypothetical individual lapse does not establish that the final, verified communication of divine law is unreliable.