MB3 51b: Borei Pri Hagafen on Kiddush Wine Exempts Wine During Meal From a Bracha (272:10); Kiddush Must be Made Where You are Eating (273:1)
Kiddush exempts wine drunk during the meal since it is part of the meal. The obligation of kiddush bamakom seudah (making kiddush where one eats) and it's parameters.
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