Commentary for Avodah Zarah 71:4
אלא לדידך דאמרת דניאל גזר עליו דניאל גזר ואתא רבי יהודה הנשיא ומבטל ליה והתנן אין ב"ד יכול לבטל דברי ב"ד חבירו אלא א"כ גדול הימנו בחכמה ובמנין
But according to your statement that [it is prohibited because] Daniel decreed against it, can it Daniel make a decree and R. Judah the Prince come and annul it? For have we not learned: A Court is unable to annul the decisions of another Court, unless it is superior to it in wisdom and numerical strength.
Daf Shevui to Avodah Zarah
If Rav is correct, that Daniel made a decree to prohibit oil, then how could another court overturn it. Later courts are almost never allowed to overturn decisions made by earlier courts.
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