If one accepted a fast on Erev Shabbat, until when must one fast?
Synopsis
The Mechaber rules one must fast until tzet hakochavim (nightfall) unless one specified otherwise at acceptance. The Rema rules that for an individual fast (taanis yachid) one need not complete the fast past when the congregation finishes prayer (after Kabbalat Shabbat), and that it is good to specify this at acceptance.
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