In the standard technical usage, a mursal narration is one in which a Successor (tābi‘ī) directly attributes a saying, action, or approval to the Prophet ﷺ without mentioning the intermediary. The classification applies whether the Successor belongs to an earlier or later generation within the tābi‘ūn.
«وَالثَّانِي: وَهُوَ مَا سَقَطَ مِنْ آخِرِهِ مِنْ بَعْدِ التَّابِعِي، هُوَ الْمُرْسَلُ»
The second category is mursal: an omission at the far end of the chain after the Successor.
Schematic chain: “compiler ← Successor ← Prophet ﷺ.” An intermediary is not named. The Successor's reputation for uprightness does not, by itself, convert that presentation into a fully connected marfū‘ chain.