Reference for Makkot 27:10

ולאידך נמי האי ודאי ק"ו פריכא הוא אלא נפקא ליה (ויקרא כ, יז) מאחותו דסיפא

And according to [Rebbi Yitzchak] also it is definitly a flawed kal v'chomer, rather then [Rebbi Yitzchak] learns out [re'shia bar re'shia] from achoso d'seifa [the extra repeated word 'sister' at the end of the verse].

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