Judges 11:34-40

When Jephthah arrived home at Mizpah, his daughter came hurrying out of the house to welcome her father home, dancing to the rhythm of tambourines. She was his only child—his one and only. When he realized who had come out, he ripped his cloak and was overcome with grief. He exclaimed, “Oh no! My dearest daughter, you have torn my heart to shreds! Must it be you I offer? I have made a solemn promise to YAHWEH, and I cannot retract it!” She said to him, “My father, you have made a vow to YAHWEH and he has delivered you from your enemies, the Ammonites. Do to me what you promised him you would do. But please grant me one thing. Spare me for two months and let me go with my friends to grieve. Let me be free to wander on the hills and to lament my sad fate.” “Go,” he replied, and he sent her away for two months. She and her friends went into the mountains and grieved because she was going to die unmarried and childless. After two months, she returned to her father, and Jephthah fulfilled his vow to YAHWEH. His daughter died still a virgin. (This was the origin of the custom in Israel that young women would go away each year to grieve and lament for the daughter of Jephthah of Gilead.)