Midrash for Bekhorot 67:5
הכא בקראי פליגי דאמר רב יהודה אמר שמואל וכן אמר ר"ל וכן אמר ר"נ אמר רבה בר אבוה
For Rab Judah reporte in the name of Samuel, and so did Resh Lakish say, and likewise R'Nahman reported in the name of Rabbah B'Abbuha: [Scripture says]: And I, behold.
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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