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The custom in many communities I have been to is for there to be a siyum on a mesechta on the day of taanit bechorot. All first borns who would otherwise have to fast attend the siyum and are thus exempt from their fast. I would like to know why that is so and why this practice is not utilized for other fast days.

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1 Answer 1

R. Tzvi Reisman has a long, in-depth discussion on this topic here, and the following are some of the main points which answer the question.

1) The obligation of this fast is unlike other fasts, in that it is only mentioned in a Baraissa of Mesechta Soferim, and not the gemara. Thus the obligation to fast started only as a minhag and so it is treated more leniently than other fasts. In addition, the gemara Yerushalmi seems to imply that one should not fast on Erev Pesach.

2) Several poskim explain that due to the weakness of our generation, if the firstborns fast on Erev Pesach they will not be able to prepare for the Festival, and may be too weak to fulfill the mitzvos of the Seder. Therefore, since this fast is already more lenient than other fasts, using a siyum to exempt the fast is the better option than fasting.

3) Another reason that some poskim mention is that there is an implicit understanding that a person does not intend to fast if there is going to be a siyum on the day that he intends to fast.

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I will have to see the article at length but a few comments 1) accordingly one would be able to apply this to the fast of esther as well 3) this cuts to the crux of the question and why I cannot mark this answer as correct - there is nothing here which correlates making a siyum to exempting one from the fast. What is the connection? –  user5092 Mar 26 at 21:16
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On number 1), Taanis Esther isn't mentioned at all in any Baraisa, Mishnah, Gemarah, Midrash etc., yet there's no similar heter for this. –  Ypnypn Mar 27 at 3:45

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