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We have already learned that the most basic requirements of nedarim – or becoming obligated by making a vow – are for a person to have clear intent, that he express it in a clear manner.
Nevertheless, as the first Mishna makes clear, there is not set formula for taking on a neder, and substitutes – referred to by the Mishna as kinuyei nedarim – or abbreviated formulations – referred to by the Gemara as yadot nedarim – will also create a full obligation.
The Gemara explains that the Isur of Bal Te'acher applies to Nezirus in the case of a person who says, "I will not leave the world before I become a Nazir."
Why is that a case of Bal Te'acher of Nezirus? The person did not yet become a Nazir; he only promised to make himself a Nazir at a later time, and his obligation to make himself a Nazir is because his statement was a Shevu'ah or a Neder Mitzvah.
The Nezirus itself, however, does not obligate him to become a Nazir. Why, then, is this a case of Bal Te'acher of Nezirus? It is merely a case of Bal Te'acher of Neder!
We continue our exploration of vows with parallel texts in the Yerushalmi as well as Prof Shaul Lieberman’s chapter on oaths and vows in his classic "Greek in Jewish Palestine.”