Reference for Bekhorot 76:38

דכתיב

R'HANINA B. ANTIGONUS SAID: WE MUST EXAMINE IT THREE TIMES IN THE EIGHTY DAYS.<span class="x" onmousemove="('comment',' And failing this examination, even if the white spots are found on the eightieth day, they are not considered a blemish, as probably during this period the defect disappeared and has now returned. This defect would, therefore, be a natural thing.');">¹⁵</span>

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