When deriving a legal ruling, ask not only “what is the ruling?” but also “by which textual indication was it reached?” That is the point of this fourth division.
Ibarat concerns intended meaning, isharah a secondary textual implication, dalalah a linguistically manifest rationale, and iqtida a necessary presupposition. The book prioritises ibarat over isharah in conflict and restricts iqtida to necessity.
Its next heading is aqsam al-khass, beginning with commands and prohibitions; that discussion belongs to Level 009.