Annulment of a Fast Vow on the Day of the Fast
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Question
Hello, if someone has vowed to fast (such as during Shovavim, etc.) and wants to annul their vow, when can they perform the annulment of vows?
Answer
Hello,
one can annul the vow only on the day of the fast because only then does the vow take effect. [It is not possible to annul a vow before it takes effect, so the annulment is not valid if done the day before or even the night before].
Source
Nedarim 90, Shulchan Aruch, Yoreh De'ah, Siman 228.
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