Reference for Beitzah 6:7

אלא לרב יוסף ולרבי יצחק דאמרי משום גזרה ספיקא דרבנן היא וכל ספיקא דרבנן לקולא

But, for Rav Yoseif and for Rabbi Yitzhak that say it's because of a [rabbinic] decree – thus a doubtful [egg] is [based on a] rabbinic [prohibition] and every rabbinic doubt is lenient!

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