Augustine of Hippo
The Scriptures do not seem to render judgment on the promise itself or its realization, similar to the account of Abraham, who was instructed by the Lord to sacrifice his son and obeyed the voice of God. Instead, the texts of Scripture recount historical events without imposing their own assessments, as illustrated by Judah, the son of Jacob, who, in ignorance, engaged in relations with his daughter-in-law Tamar, mistakenly believing her to be a prostitute. The Holy Scriptures do not explicitly condemn or commend actions but depict them as they are, enabling readers to reflect on and evaluate them through the lens of virtue and divine law.
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Consequently, the Bible refrains from commenting on the vow made and its fulfillment, inviting us to form our own conclusions about the situation, which suggests that such a vow incited God's displeasure and resulted in the tragic encounter of Jephthah's only daughter rushing to meet her father.