Reference for Chullin 248:30

אית ליה לר' ישמעאל את שבא לכלל מגע בא לכלל משא לא בא לכלל מגע לא בא לכלל משא והכא היינו טעמא משום דבא לכלל מגע מלפניו

R'Akiba says: It is written: 'He that toucheth', and 'He that carrieth': therefore, what comes within the scope of uncleanness by contact, comes within the scope of uncleanness by carrying, and what does not come within the scope of uncleanness by contact does not come within the scope of uncleanness by carrying.<span class="x" onmousemove="('comment',' Therefore, argues R. Akiba, it cannot be said that these pieces of flesh convey uncleanness by carrying and not by contact, as R. Ishmael would have it.');">¹⁶</span>

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