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Why do some poskim rule safek brachos lechumra when the standard principle is safek d'rabbanan lekula? The shiur uses the Mishneh LaMelech's yesod about safek takanos chachamim: when uncertain what the chachamim originally enacted, we lack authority to be lenient. This explains the machloket and reconciles seemingly contradictory rulings in Rishonim.
This shiur presents an intensive analysis of one of the most fundamental questions in hilchos brachos: whether safek brachos is lekula (lenient) or lechumra (stringent). The Gemara (גמרא) presents a dispute where Rav Avfas rules safek is lekula, while the RI (from Tosafos (תוספות)) holds lechumra, creating a fundamental machloket that has far-reaching implications for practical halacha (הלכה). Rav Zweig examines the Magen Avrohom's difficult question: if the standard rule is "safek brachos lekula," how can anyone argue for lechumra? He presents Rav Kiveiger's innovative approach, which distinguishes between birchas hamitzvos and birchas hanehenin. According to this view, birchas hanehenin stems from the issur of "kol haneheneh min ha'olam hazeh b'lo bracha k'ilu gazal" - enjoying this world without a blessing is like theft. Since the underlying issue is one of gezel (theft), the principle of safek gezel lechumra should apply.
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Brachos 12a
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