ציטירנדיקער פּירוש אויף במדבר 30:10

ואשה כי תדור, “and if a woman makes a vow, etc.” A female of twelve years and over is called אשה, “a woman.” Her vows and oaths are legally valid. If she is between 11 and 12 years of age she is presumed to be a minor though she is examined if she understands the implication of a vow or an oath. If she does, she is subject to the same rules as a male between the ages of 12 and thirteen. If she is less than eleven years old she is a minor in all respects of the law. Her pronouncements have no legal standing whatever. If a female is over 12 years of age or a male over 13 years of age their vows or oaths are legally binding even if they did not know to whom [i.e. that this involves an undertaking vis-a vis G’d. Ed.] they made such commitments (Maimonides Hilchot Nedarim 11,1-3).
This entire paragraph reveals many important laws concerning vows and oaths in very few words. The legal status of women concerning vows may be divided into four categories: 1) A נערה, girl between the age of 12-12 years and six months; 2) An ארוסה, a girl betrothed but not yet having moved in with her husband. 3) A married woman (after חופה); 4) A widow. When a נערה has a father she remains under his legal control and her father can invalidate her vows on the day he hears about them but not later. The logic behind this is that she would have attached a mental rider to her vow that her father would approve of it. If she finds that she was mistaken and her father objected upon hearing of it, her vow was never valid in the first place. The same logic does not apply to vows undertaken by a male of corresponding age. Just as the father is legally empowered to sell the services of his daughter to a stranger, an entitlement which does not extend to selling the services of his son, so the father is also legally entitled to countermand vows made by a daughter not yet fully of age.
When such a נערה has attained the age of 12 years and six months she is considered adult in all legal respects and no longer under her father’s legal control (Niddah 47). She is fully responsible for all her vows and oaths, the same as a widowed woman or a divorcee. The words of verse 10: כל אשר אסרה על נפשה יקום עליה, “everything she has prohibited upon herself- shall remain upon her,” apply to such a 12 and a half year old single girl. If, while under the age limit, she made a vow and her father annulled it on the day he heard of it, it is as invalid as if it had never been uttered. When the Torah adds the words וה' יסלח לה, that “the Lord will forgive her,” the sages reasoned that these words are applicable when the girl who had made the vow is in need of forgiveness, such as when she violated her vow being unaware that her father had already canceled it (Niddah 47). Obviously, if someone commits what he or she perceives to be a violation of G’d’s law they are in need of forgiveness even if technically, for reasons unknown to them they did not commit a sin.
As to the woman who has been betrothed. The Torah speaks here about a woman who prior to her betrothal made a vow or swore an oath and who enters the first stage of her marriage with such vows still valid. The Torah, by employing the words, ואם היו תהיה לאיש indicates that the girl (under 12 and a half years old) has not yet completely left her father’s domain and also has not yet come under the domain of her husband concerning his interest in the matter. Her father and husband-to-be must both annul her vows in order for such an annulment to be legally valid. This is what we learned in Nedarim 66 seeing that we presume that when she made the vow she mentally resolved that it would be with the approval of both her father and her husband-to-be. Both her father and her husband-to-be have to hear it on the same day in order for both of them together to be able to annul it. The Talmud adds, that if the fiance of the betrothed girl dies before she reaches the age of maturity and she had moved into her husband’s home (after חופה), she reverts to her father’s domain and he can cancel her vows as if she had made them before she was married. If her father died prior to her having become fully married, (חופה), her husband cannot annul her vows until after she is fully married to him (Maimonides Hilchot Nedarim 11,10).

ויקם השדה, “this formulation uses the verb קום in the sense of being stable, remaining firmly established. Examples are Numbers 30,10 where it refers to the validity until honoured, of a vow made by a woman of age and not married. In this instance, the Torah records that the transfer of the cave and field adjoining Machpelah from Efron to Avraham remains valid forever. Avraham himself, of course, also acquired the legal right to be buried alongside his beloved wife Sarah.