Judges 11:34-40 - Jephthah's Daughter
34 And Jephthah came to Mizpah to his house, and, behold, his daughter came out to meet him with timbrels and with dances. And she was his only child. Besides her he had neither son nor daughter. 35 And it came to pass, when he saw her, that he tore his clothes, and said, Alas, my daughter! Thou have brought me very low, and thou are one of those who trouble me, for I have opened my mouth to LORD, and I cannot go back.
36 And she said to him, My father, thou have opened thy mouth to LORD. Do to me according to that which has proceeded out of thy mouth, inasmuch as LORD has taken vengeance for thee on thine enemies, even on the sons of Ammon. 37 And she said to her father, Let this thing be done for me: Let me alone two months, that I may depart and go down upon the mountains, and bewail my virginity, I and my companions.
38 And he said, Go. And he sent her away for two months. And she departed, she and her companions, and bewailed her virginity upon the mountains. 39 And it came to pass at the end of two months, that she returned to her father, who did with her according to his vow which he had vowed, and she knew no man. And it was a custom in Israel, 40 that the daughters of Israel went yearly to celebrate the daughter of Jephthah the Gileadite four days in a year.