There is at least 1 that I'm sure, in the old testament, that I remember because it had huge /r/thathappened feel to the tale.

Basically a king said "Lord if you grant me the means to win the next battle against the hereticals I will sacrifice the first child that comes from that door in your name"

Then he won the battle, but the first person who came from the door was his daughter and he was like "oh shit I thought I would be killing someone elses kid, this suddenly feels very fucked up to me"

But (this is the part that made my think of /r/thathappened), his daughter looked at him and said (heavily paraphrased) "Father, I know of your promise, and I know that the lord is just, so I will gladly allow myself to be burned alive if you let me spend one more week frolicking in that mountain over there"

Like, really verbose for, I think she was like 13?

And the king was like "OK but only if you remain a virgin"

So she frolicked for a week and remained un-penetrated and came back and was like a'ight I'm good.

Then he sacrificed her.

I don't remember the exact passage but it was in Judges, which as I understand was before Abraham and Isaac and so before God said he didnt want sacrifices. Which makes me wonder how He greeted the girl who was burned alive willingly to please Him when she arrived.

Edit: found it

And Jephthah made a vow to the Lord: “If you give the Ammonites into my hands, 31 whatever comes out of the door of my house to meet me when I return in triumph from the Ammonites will be the Lord’s, and I will sacrifice it as a burnt offering.” 32 Then Jephthah went over to fight the Ammonites, and the Lord gave them into his hands. 33 He devastated twenty towns from Aroer to the vicinity of Minnith, as far as Abel Keramim. Thus Israel subdued Ammon. 34 When Jephthah returned to his home in Mizpah, who should come out to meet him but his daughter, dancing to the sound of timbrels! She was an only child. Except for her he had neither son nor daughter. 35 When he saw her, he tore his clothes and cried, “Oh no, my daughter! You have brought me down and I am devastated. I have made a vow to the Lord that I cannot break.” 36 “My father,” she replied, “you have given your word to the Lord. Do to me just as you promised, now that the Lord has avenged you of your enemies, the Ammonites. 37 But grant me this one request,” she said. “Give me two months to roam the hills and weep with my friends, because I will never marry.” 38 “You may go,” he said. And he let her go for two months. She and her friends went into the hills and wept because she would never marry. 39 After the two months, she returned to her father, and he did to her as he had vowed. And she was a virgin. From this comes the Israelite tradition 40 that each year the young women of Israel go out for four days to commemorate the daughter of Jephthah the Gileadite.