Judges 11 in the early church

Now Jephthah the Gileadite was a mighty man of valor; he was the son of a prostitute, and Gilead was his father.

Some time later, when the Ammonites fought against Israel

I have not sinned against you, but you have done me wrong by waging war against me. May the LORD, the Judge, decide today between the Israelites and the Ammonites.”

Then the Spirit of the LORD came upon Jephthah, and he passed through Gilead and Manasseh, then through Mizpah of Gilead. And from there he advanced against the Ammonites.

Jephthah made this vow to the LORD: “If indeed You will deliver the Ammonites into my hand,

then whatever comes out the door of my house to greet me on my triumphant return from the Ammonites will belong to the LORD, and I will offer it up as a burnt offering.”

And when Jephthah returned home to Mizpah, there was his daughter coming out to meet him with tambourines and dancing! She was his only child; he had no son or daughter besides her.

As soon as Jephthah saw her, he tore his clothes and said, “No! Not my daughter! You have brought me to my knees! You have brought great misery upon me, for I have given my word to the LORD and cannot take it back.”

“My father,” she replied, “you have given your word to the LORD. Do to me as you have said, for the LORD has avenged you of your enemies, the Ammonites.”

She also said to her father, “Let me do this one thing: Let me wander for two months through the mountains with my friends and mourn my virginity.”

After two months, she returned to her father, and he did to her as he had vowed. And she had never had relations with a man. So it has become a custom in Israel

that each year the young women of Israel go out for four days to lament the daughter of Jephthah the Gileadite.