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Why can an egg laid on one day of Yom Tov Sheni of the Diaspora be eaten on the other day, yet eruv tavshilin cannot be made on the first day? Rav Chaim Brisker and the shiur develop the distinction: Yom Tov Rishon is vadai; Yom Tov Sheini is a minhag kept as a safek. The shiur explores when the "two kedushos" principle permits preparation between days and when it does not.
This shiur analyzes the Gemara (גמרא) in Beitzah 6a, focusing on the laws of eruv tavshilin and muktzeh on the two days of Yom Tov observed in the Diaspora (shenei yom tov shel galuyot). The central question is how to reconcile two seemingly contradictory halachot: on one hand, an egg laid on the first day of Yom Tov may be eaten on the second day (nolad bezeh muteres bezeh), yet on the other hand, one cannot make an eruv tavshilin on the first day of Yom Tov to permit cooking on the second day for Shabbos (שבת). The Gemara presents Rava's statement that one may place eruv tavshilin on Yom Tov with a conditional stipulation (tenai), saying: "If today is Yom Tov, I don't need the eruv for tomorrow; if tomorrow is Yom Tov, this eruv should be effective." This works for shenei yom tov shel galuyot because both days are kept mi-safek (out of doubt). However, the Rambam (רמב"ם) rules that in our time, when the calendar is fixed and we know which day is truly Yom Tov, one cannot make such a conditional eruv. The Rambam explains that today, the first day is vadai (certainly) Yom Tov, and the second day is kept only as a minhag (custom) based on the practice of our ancestors.
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Beitzah 6a
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