Q&A: Fasting
Originally published:
This is an English translation (via GPT-5.4). Read the original Hebrew version.
Fasting
Question
Can I say in one Mincha prayer that I am accepting two days of fasting—for example, from dawn until nightfall—or do I need to say it each day in order to accept the following day?
Answer
It seems obvious that there is no problem. The whole idea of accepting the fast in advance is mainly relevant for someone who vowed to fast, in which case accepting it at Mincha defines the next day as a fast day that serves as fulfillment of the vow. But if you did not make a vow, you can fast even without formally accepting it beforehand.