Does forgetting to recite the blessing invalidate the eruv/shituf?
Synopsis
The Rema rules that omitting the blessing does not invalidate the eruv, since blessings are never invalidating factors. The Mishnah Berurah extends this to include even omitting the declaration formula ('b'hadein eruva'). The Aruch HaShulchan adds nuance: the declaration may be required in cases where it is the only indicator that the food was intended as an eruv, but not in communities with other clear indicators.
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Discussion
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