The four degrees of clarity are zahir, nass, mufassar and muhkam. A zahir meaning is immediately apparent; nass gains force from being the intended purpose of the discourse; mufassar removes relevant ambiguity of interpretation or specification; muhkam also excludes abrogation.
The statement permitting trade and prohibiting usury conveys those rules explicitly, while the intended contrast between them illustrates nass. Ask both how clear a meaning is and what makes it clear.
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Comprehensive Revision and Final Assessment — Mabadi al-Usul
The four degrees of clarity are zahir, nass, mufassar and muhkam. A zahir meaning is immediately apparent; nass gains force from being the intended purpose of the discourse; mufassar removes relevant ambiguity of interpretation or specification; muhkam also excludes abrogation.
The statement permitting trade and prohibiting usury conveys those rules explicitly, while the intended contrast between them illustrates nass. Ask both how clear a meaning is and what makes it clear.