Midrash for Bekhorot 71:74
מתיב רב שיזבי
Said Raba: We have also learnt this: A PRIEST'S WORD IS TAKEN IF HE SAYS 'I HAVE SHOWN THIS FIRSTLING AND IT IS BLEMISHED'.
Sifrei Devarim
(Devarim 15:20) "And if there be in it a blemish": This tells me only of an animal that was born unblemished and became blemished. Whence do I derive (the same for) one that was born blemished! From "every blemish."
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