Reference for Zevachim 33:1
אלא איכא למיפרך הכי ואיכא למיפרך הכי כל חדא וחדא תיקו בדוכתיה:
But you can refute it thus, and you can refute it thus;<span class="x" onmousemove="('comment',' You can argue either way.');"><sup>1</sup></span> [therefore] let each one remain in its place.<span class="x" onmousemove="('comment',' Assume each law to be without exceptions. Thus, when Scripture permits bereavement to a High Priest, it applies to both private and public sacrifices, while it is forbidden to an ordinary priest likewise in the case of both. Again, when uncleanness is forbidden in the case of a private sacrifice, the interdict applies to the High Priest also; on the other hand, when it is permitted in the case of public sacrifices, that applies to an ordinary priest too.');"><sup>2</sup></span>