«وَأَحَلَّ اللَّهُ الْبَيْعَ وَحَرَّمَ الرِّبَا»
Allah has permitted trade and prohibited usury.
The permissibility of trade and prohibition of usury are apparent in the wording. In context, distinguishing the two is a central purpose of the statement, which supports the classification as nass in the textbook's analysis. One text can have different aspects of indication without making zahir and nass identical categories.