²⁹Then 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. ³⁰Jephthah made this vow to the LORD: “If indeed You will deliver the Ammonites into my hand, ³¹then 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.” ³²So Jephthah crossed over to the Ammonites to fight against them, and the LORD delivered them into his hand. ³³With a great blow he devastated twenty cities from Aroer to the vicinity of Minnith, as far as Abel-keramim. So the Ammonites were subdued before the Israelites. ³⁴And 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. ³⁵As 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.” ³⁶“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.” ³⁷She 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.” ³⁸“Go,” he said. And he sent her away for two months. ³⁹So she left with her friends and mourned her virginity upon the mountains. 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. ⁴⁰So 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.