Augustine of Hippo
The Scriptures do not seem to issue a verdict on the promise itself or its realization, similar to the situation with Abraham, who was instructed by the Lord to offer his son, and he obeyed the divine command. Instead, the biblical texts recount historical events and leave their interpretation up to the discernment of the reader, much like the story of Judah, the son of Jacob, who, in ignorance, engaged in relations with his daughter-in-law Tamar, mistakenly thinking she was a prostitute. The Holy Scriptures refrain from overtly condemning or endorsing actions; rather, they depict events plainly so that they can be assessed in light of righteousness and God’s commandments.
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Thus, the Bible provides no analysis on the vow made and its execution, placing the responsibility on us to contemplate the issue, leading to the inference that such a vow provoked God's fury, resulting in the tragic outcome of Jephthah's only daughter being the first to greet her father upon his return.