Toward the end of his life, as one of his final missions, Moses imparts laws to the Israelites designed to anchor their loyalty to God while protecting the nation from moral pitfalls. A key summary of the laws regarding personal vows shifts the focus away from the inherent holiness of the vow itself. Instead, it centers on the delicate relationships and dependencies between a woman and the central figures in her family: her father and her husband. The underlying goal is to establish the boundaries of a woman's religious independence, ensuring her personal commitments do not conflict with the needs of the family or the authority of the household head. This reflects an understanding that her path involves integrating into and building a home alongside her husband.
Interestingly, this summary reverses the chronological order presented earlier in the laws, placing the husband's role before the father's, and it notably omits other situations such as those of a widow or a divorcee [ברכת אשר]. When addressing the dynamic between a husband and his wife, the focus is on a mature, married woman [אבן עזרא]. Personal vows carry the risk of creating a barrier or emotional distance between spouses. To prevent this separation, a husband's authority to cancel his wife's vows is not absolute. It is strictly limited to vows involving self-affliction or matters that directly impact their marital intimacy, such as a vow to avoid grooming or to abstain from marital relations [הכתב והקבלה, תורה תמימה].
The laws then transition to the relationship between a father and his young, unmarried daughter. By placing the husband and the father side by side, a direct legal comparison is drawn between them [מלבי"ם]. The primary approach among commentators is that the father's authority mirrors that of the husband, restricting his ability to cancel vows only to those involving self-affliction or intimate matters. However, [רמב"ם] disagrees and adheres to a more literal understanding. He maintains that a father possesses absolute authority to cancel any of his young daughter's vows. Because a father is responsible for her overall well-being and her future, he is deeply invested in her ability to find favor in the eyes of a potential husband. Therefore, even vows relating to personal grooming fall under his full jurisdiction [רבנו בחיי, תורה תמימה].
As long as a young woman remains in her father's home, she is under his domain. This status grants the father not only the right to cancel her vows but also specific financial rights during her youth, such as keeping her earnings and the money given for her betrothal [תורה תמימה, העמק דבר]. This framework specifically excludes a woman who is widowed or divorced after a full marriage, as her period of youth is no longer tied to her father's authority [מלבי"ם]. Finally, the blending of these family dynamics highlights the unique status of a young woman who is betrothed. Because she is legally promised to a husband but still physically resides in her father's house, the authority over her vows is shared. Both her father and her betrothed husband must act in partnership to cancel a vow. Yet, if the father dies before the marriage is fully finalized, his share of authority does not automatically transfer to the betrothed husband, as she is still fundamentally considered a member of her father's household [תורה תמימה, הכתב והקבלה].