Does answering Barchu or saying Mizmor Shir constitute acceptance of Shabbat that prohibits further melacha?
Synopsis
The Mechaber rules that after the community answers Barchu, even though it is still day, eiruv and insulating are prohibited because they have accepted Shabbat. For Ashkenazi communities, saying Mizmor Shir (or in later practice, Lecha Dodi) has the same effect.
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