The commentary records several explanations of the genitive reading. One treats the genitive as grammatical adjacency, which does not necessarily establish the same legal act.
Another relates the accusative to washing bare feet and the genitive to permissible wiping over footgear; an explanation along these lines is attributed to al-Shafi‘i.
Some inferred a choice between washing and wiping, but the explanation sets the hadith evidence for washing bare feet against that conclusion.
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Interpretations of the Genitive Reading
Taharah and Wudu Obligations: Limits, Evidence and Juristic Differences
The commentary records several explanations of the genitive reading. One treats the genitive as grammatical adjacency, which does not necessarily establish the same legal act.
Another relates the accusative to washing bare feet and the genitive to permissible wiping over footgear; an explanation along these lines is attributed to al-Shafi‘i.
Some inferred a choice between washing and wiping, but the explanation sets the hadith evidence for washing bare feet against that conclusion.