Midrash for Bekhorot 51:6
אמר רבי יהודה
If one plucks wool from an unblemished firstling, although subsequently there appeared a blemish on it and he slaughtered it, the wool is forbidden [to be used].<span class="x" onmousemove="('comment',' For in that case, even Akabya agrees that the wool is forbidden to be used, for we apprehend that he may be led to detain the firstling and prevent it from being offered up on the altar. The same ruling also applies to wool which has become detached from the animal.');"><sup>5</sup></span>
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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