Midrash for Bekhorot 71:71
מילתא דעבידא לאיגלויי לא משקרי בה אינשי
<big><b>GEMARA: </b></big>Rab Judah said that Rab said: A priest's word is taken if he says [to an expert].'
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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