Midrash for Bekhorot 67:20
מתקיף לה ר"נ בר יצחק
And [how does] R'Eliezer [interpret it]? - Doubtful terumah is also fit terumah for thee, in case Elijah comes and pronounces it clean.
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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