Reference for Bekhorot 66:25

מתני ליה ר' אלעזר לבריה ואמרי לה ר' חייא לבריה

R'Joshua says: If it was lying in a clean place, he must put it in a filthy place a if it was covered, he must open it, while R'Gamaliel says: He must not introduce any new factor.<span class="x" onmousemove="('comment',' V. Ter. VIII, 8.');">¹⁵</span>

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