Are the exceptions to fasting (Shabbat, Festivals, Chanukah, Purim, Rosh Chodesh) binding even if one has already accepted a vow to fast on those days?

Fasts & MourningPersonal Fasts

Synopsis

Even if an individual has accepted a vow or commitment to fast every day of the year, the days excepted by halakha (Shabbat, Festivals, Chanukah, Purim, Rosh Chodesh) interrupt and override the vow.

Late Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

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