Midrash for Bekhorot 51:21
ור' יהודה סבר
All agree that if the expert had permitted [the animal, the wool] is allowed [to be used], and if the expert had not permitted it, it is not allowed to be used.
Sifrei Devarim
(Devarim 15:19) "Every firstling (bechor)": Scripture apprises us that a bechor is to be eaten (by the Cohein) all of its (first) year. This tells me only of an unblemished bechor. Whence do I derive (the same for) a blemished one (that cannot be sacrificed)? From "every bechor." From "You shall not work with the bechor of your bullock, etc." we are taught that it is forbidden to shear or to work with a bechor. This tells me only of an unblemished bechor. Whence do I derive (the same for) a blemished one? From "every bechor."
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