About this episode
Another story is told of Rabbi Yishmael son of Rabbi Yosi who went to dissolve a vow but any petach the rabbis suggested wasn't working. The rabbis were upset that they couldn't resolve this and a launderer came and hit Rabbi Yishmael since he was upsetting the rabbis. Rabbi Yishmael then used that as his petach , as had he realized he would have gotten beaten, he never would have vowed. Why is that not considered nolad , a new reason that he never would have thought of at the time of making the vow, as nolad is not able to be used for a petach . Abaye and his wife each wanted to marry her daughter off to one of their own relatives. In order to insist that she obey him, he vowed her to not benefit from him if she married her off to her own relatives. When she actually does that, he goes to dissolve the vow, using the petach suggested by Rav Yosef that had he realized she was actually going to marry off her daughter to her own relatives, he never would have taken the vow. A similar story of a man who vowed that his wife should not go on the pilgrimage to Jerusalem is brought to prove that this type of petach works. The Mishna quotes Rabbi Eliezer ben Yaakov saying that if you vow to insist that a friend eats at your house, you can make a declaration before that you is nullifying a vow that you are about to make. This works as long as they remember the declaration at the time of the vow. The Mishna is unclear - if the friend knows about the declaration, then the vow is anyway ineffective to encourage the friend to eat. Therefore, they reinterpret the Mishna by splitting it into two. The first part is to say that a vow to encourage a friend to eat at one's house is a neder zeruzin and not even effective at all. Secondly, one should make a declaration at the beginning of the year that all vows they make will be nullified. Abaye and Rava disagree about whether this is effective only if one doesn't remember the declaration at the time of the vow or can there even be a case where one somewhat remembers and yet, it can still be effective. Rav Huna bar Chinina wanted to institute that everyone makes this declaration but Rava discouraged it so that people do not treat vows lightly. Is it from here that the custom arose to say kol nidrei on Yom Kippur night or to annul our vows on erev Rosh Hashana? Do the rabbis disagree with Rabbi Eliezer ben Yaakov or not?