Midrash for Bekhorot 71:8
אלא לעדות שהאשה כשרה לה בלבד
R'Yemar permitted the evidence of a witness reporting an eye-witness to be valid in connection with a firstling.
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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