Commentary for Bekhorot 65:33

כיוצא בו אין מרגילין בבכור ולא בפסולי המוקדשין

because he undertakes a labour of which he can make no use [on that day], but as regards a firstling, who is the authority [for the law just quoted]? - Said R'Hisda: It is the view of Beth Shammai,<span class="x" onmousemove="('comment',' Who hold that a blemished first-born remains holy even after its slaughtering, and since in the case of an unblemished firstling, flaying in this manner would be prohibited because he impairs the flesh for fear of cutting the skin, so the same ruling applies to a blemished firstling.');">¹⁸</span>

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