Exegetical reports often place various kinds of material beside a verse. A Companion citing the verse in debate, reciting it in instruction, invoking it as evidence or explaining its pronunciation is not necessarily reporting its occasion of revelation.
Reports about a sūrah's merit, the manner of carrying out a ruling or an event resembling a verse may be useful for interpretation without documenting the verse's descent.
Such material should be classified by function: proof-texting, reading, merit, legal explanation, application or an actual historical cause. The distinction prevents different sorts of testimony from becoming confused.