Midrash su Deuteronomio 14:13

3) R. Akiva says: "Ayah" is written here and "ayah" is written elsewhere (Devarim 14:13). Just as with "ayah" there, "ra'ah" is a kind of "ayah," (making it subject to "you shall not eat,") so, with "ayah" here, "ra'ah" is a kind of "ayah," (making it subject to "you shall not feed").