Reference for Beitzah 5:6

ורבי יצחק מאי טעמא לא אמר כרב יוסף אמר לך ביצה בלועה ומשקין בלועין לאפוקי פירות דמגלו וקיימו

And Rabbi Yitzhak, what's the reason he is not speaking according to Rav Yoseif? He [Rabbi Yitzhak] would say to you: "An egg is swallowed [by the chicken], and juice is swallowed [by the fruit, i.e. they are both coming out of something that is separate] – to exclude fruit which is exposed and exists [separately from the tree]."

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