שופטים, פרק י״א, פסוק ל״ו

Jephthah's daughter responds to her father's tragic vow with absolute acceptance, forever linking his military triumph to her personal fate. She makes it clear that he must fulfill his promise. Because the specific condition her father set was met and God granted him victory over the Ammonites, the vow takes effect immediately and becomes fully binding [מצודת ציון, ביאור שטיינזלץ, מצודת דוד].

Her response, however, exposes a deep misunderstanding that ultimately seals her fate. She argues to her father that this specific vow is unlike ordinary promises that can be undone. Normally, a wise man can annul a vow if the person who made it expresses original regret, admitting that had they known the outcome, they never would have made the promise in the first place. Yet in this case, because the vow directly led to the defeat of their enemies, she reasons that her father cannot possibly regret making it from the start. He can only feel sorrow over the current result. This argument was actually a legal error, as a vow can indeed be annulled based on later regret. Unfortunately, her mistake misled her father, convincing him that the vow was irreversible and preventing him from seeking out wise men to cancel it [מלבי״ם].

Despite the severe nature of her acceptance, fulfilling the vow did not necessarily mean she would be physically sacrificed. Instead, the practical application of her father's words resulted in a life of absolute seclusion. She agreed to be closed off in an isolated home, never to marry and never to leave for the rest of her days. This life of extreme self-denial became a model that eventually influenced other nations to establish similar places of seclusion for women [אברבנאל].