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What makes a bracha invalid when you have wrong intent or say wrong words? The shiur uses a Rambam (רמב"ם)-Raavad dispute to show that the ikar bracha is "Baruch Ata Hashem (ה׳) Elokeinu Melech HaOlam" - but only if your underlying intent creates some valid bracha framework. This resolves why you can correct "HaKel HaKadosh" on Rosh Hashanah but not "Mekadesh HaShabbos" on Yom Tov.
This shiur provides an in-depth analysis of Gemara (גמרא) Berachos 12a, focusing on the fundamental question of what constitutes the "ikar bracha" (essential part of a blessing) and when improper intent invalidates a blessing. Rabbi Zweig begins by reviewing the previous day's discussion of Rashi (רש"י)'s position that the ikar bracha is "Baruch Ata Hashem (ה׳) Elokeinu Melech HaOlam," meaning that if one has incorrect kavana during this opening formula, the blessing is invalid even if corrected before the closing. The shiur examines a crucial Rambam (רמב"ם) in Hilchos Brachos regarding various scenarios: when one intends to say "shakol" but says "borei pri hagefen," or when one intends "borei pri hagefen" but says "borei pri ha'etz." The Rambam rules that as long as one had proper kavana during the shem and malchus ("Baruch Ata Hashem Elokeinu Melech HaOlam"), the blessing is valid even with an incorrect closing. This directly supports Rashi's view that the ikar bracha is the opening formula.
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Berachos 12a
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