Midrash for Bekhorot 67:27
רב אמר
[as follows] : Rab says, the opinion of Rab Judah is the rule, whereas Samuel says: The opinion of R'Simeon is the rule?<span class="x" onmousemove="('comment',' V. supra 25a.');"><sup>13</sup></span>
Sifrei Devarim
(Devarim 14:3) "You shall not eat any abomination": R. Eliezer says: Whence is it derived that if one slit the ear of a bechor (a first-born beast, thus blemishing it) and ate of it (the beast, after slaughtering it), he transgresses a negative commandment? From "You shall not eat any abomination."
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