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The Observance of the Mitzvot by the Avot
From the pasuk of "עקב אשר שמע אברהם בקולי" the Gemara derives that the Avot kept all the mitzvot and even Eruvin. Why single out Eruvin? Did the Avot really keep the all of the commandments - didn't Yaakov marry two sisters?
Shiur provided courtesy of Torah Anytime