She said to him, My father, you have opened your mouth to Yahweh; do to me according to that which has proceeded out of your mouth, because Yahweh has taken vengeance for you on your enemies, even on the children of Ammon.
I believe Jephthah offered his daughter as a human sacrifice. What Jephthah did to his daughter may have been acceptable to Molech, but it was not to Yahweh. A few years later Saul also made a foolish vow and almost slew his son Jonathan (1 Samuel 14:39; 1 Samuel 14:44-45). The only thing that prevented that tragedy was the intervention of the Israelites. Ignorance or disregard of God’s Word is not only unfortunate, but it is also dangerous.