במדבר, פרק ל׳, פסוק ט״ו

A husband's reaction to his wife's vow carries significant legal weight. When he listens to her vow and chooses to offer no response, his silence is not merely a lack of action but a decisive legal confirmation. By hearing the vow and deciding not to protest, his silence is treated as full consent and acceptance of the situation [ספורנו].

Sometimes, this silence stems from a complex psychological motive rather than genuine agreement. A husband might remain quiet simply to cause his wife distress, leaving her in a state of uncertainty so she believes he does not care about her suffering. Even if his original intention was never to uphold the vow, if the allowed time to cancel it passes, the vow becomes fully binding [תורה תמימה, רש ר הירש, מלבי״ם]. Conversely, if he remains silent with the clear and explicit intention to uphold the vow, it takes effect immediately, and he loses any right to cancel it later that same day [רש ר הירש].

The specific window of time a husband has to cancel a vow is a central issue. The primary approach among commentators is that this period is not a full twenty-four hours. Instead, the opportunity to cancel expires with the setting of the sun and the emergence of the stars on the very day he hears the vow [רש״י, שפתי חכמים]. Therefore, if he learns of the vow during the day, he only has until nightfall to act. However, if he hears the vow at night, his right to cancel extends throughout that night and the entire following day until sunset [רבנו בחיי, בכור שור, תורה תמימה, גור אריה]. In contrast, some commentators point out that a simpler reading suggests the timeframe is indeed a full twenty-four-hour period, a view also shared by certain Talmudic sages [שד״ל, מזרחי, יריעות שלמה, הדר זקנים].

If the husband remains silent until the permitted time runs out, the vows become permanently valid and can no longer be undone [חזקוני, ביאור שטיינזלץ]. Because the confirmation is viewed retroactively, staying quiet on the day he heard the vow effectively establishes it from that initial moment [אבן עזרא], though a notable translation frames this establishment as an action taking effect in the future [נתינה לגר]. Because this timeframe is strictly limited to that specific day, a husband is permitted to cancel his wife's vows even on the Sabbath. This differs from the standard process of a sage canceling a vow, which is avoided on the Sabbath, because if the husband does not act immediately, his right is permanently lost [רבנו בחיי].

This legal power also carries heavy moral responsibility. If a husband remains silent on the day he hears the vow but later lies to his wife, telling her that he had canceled it, he creates a severe stumbling block. If she then violates the vow by mistake, she is completely free from any punishment. Instead, the husband who misled her takes on the full burden of the guilt, as anyone who causes another to fail must bear the resulting punishment in their place [רבנו בחיי].