Reference for Bekhorot 85:23

ולכתבינהו רחמנא כולהו בחד וגרב וילפת הכא והכא ולילפו מחדא

For if they were not free [for interpretation], it can be objected [as follows]: We cannot infer [the blemishes in connection with] a human being from those of an animal, for in the latter case the animal itself is offered on the altar.<span class="x" onmousemove="('comment',' And therefore the law is more stringent as regards its blemishes.');">¹³</span>

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