Don't know if anyone is interested in consensual sacrifice, but....
The story of Jephthah and his daughter (Judges 11:31 - 40) is one of those like things found in the Old Testament that make you go "What the fuck?".
Before leading his army into battle with the Ammonites, Jephthah swore an oath: “If you will give the Ammonites into my hand, 31 then whatever comes out from the doors of my house to meet me when I return in peace from the Ammonites shall be the LORD's, and I will offer it up for a burnt offering.”. The results should be pretty obvious; the first thing to come a greet him after his victory was his daughter.
34 Then Jephthah came to his home at Mizpah. And behold, his daughter came out to meet him with tambourines and with dances. She was his only child; besides her he had neither son nor daughter. 35 And as soon as he saw her, he tore his clothes and said, “Alas, my daughter! You have brought me very low, and you have become the cause of great trouble to me. For I have opened my mouth to the LORD, and I cannot take back my vow.” 36 And she said to him, “My father, you have opened your mouth to the LORD; do to me according to what has gone out of your mouth, now that the LORD has avenged you on your enemies, on the Ammonites.” 37 So she said to her father, “Let this thing be done for me: leave me alone two months, that I may go up and down on the mountains and weep for my virginity, I and my companions.” 38 So he said, “Go.” Then he sent her away for two months, and she departed, she and her companions, and wept for her virginity on the mountains. 39 And at the end of two months, she returned to her father, who did with her according to his vow that he had made. She had never known a man, and it became a custom in Israel 40 that the daughters of Israel went year by year to lament the daughter of Jephthah the Gileadite four days in the year.
The existing text does not clearly state if the sacrifice was carried out (personally, I think the story was edited by a well intentioned scribe). If it wasn't, then Jephthah broke his vow to Yahweh which would be a major sin. On the other hand, human sacrifice is supposed to be abhorrent to Yahweh and forbidden to the Israelites (this may not have always been the case, but that's another story). He's damned if he does & damned if he doesn't. But, whatever he did, he wasn't punished, Jephthah continued to enjoy military success. Jewish and Christian theologians have been trying to explain away the disturbing implications of the story. They've read between the lines to claim that the daughter (whose name is never given) "sacrificed" herself by remaining a virgin for life. Frankly, I think this is bunk. I believe Jephthah did keep his vow & sacrificed his daughter. I'm not alone in this opinion either:
http://www.chabad.org/library/article_cdo/aid/638426/jewish/What-happened-to-Jephthahs-daughter.htm
https://answersingenesis.org/bible-characters/jephthahs-vow/
https://www.biblegateway.com/resources/all-women-bible/Jephthah-8217-s-Daughter
http://www.tektonics.org/gk/jepthah.php
A note about Ancient Israelite animal sacrifices: The proscribed method seems to be that the priest slits the throat of the sacrifice, with the blood being collect in a vessel to be poured over the alter. In the case of a "burnt offering", as Jephthah promised in his vow, the entire animal (or, girl, in this case) is then burned to ashes.
OK. Enough scholarly bullshit. This is my interpretation of Jepthah's Daughter.
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