Reference for Niddah 57:69

אי כל היולדות מטנפות הא מדלא מטנפה בכור מעליא הוא

and in the case of this beast, since it did not secrete, the majority rule has been impaired. If, however, all that bear secrete, must not the young, since this beast did not secrete, be a valid firstling?<span class="x" onmousemove="('comment',' Why then was it described as one of a doubtful nature? ');">⁶¹</span>

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