Judges 11:33-38

³³And he smote them from Aroer until thou come to Minnith, twenty cities, even unto Abel-Cheramim, with a very great slaughter; and the children of Ammon were subdued before the children of Israel.

³⁴And Jephthah came to Mizpah to his house, and behold, his daughter came out to meet him with tambours and with dances; and she was an only child: besides her he had neither son nor daughter.

³⁵And it came to pass, when he saw her, that he rent his garments, and said, Alas, my daughter! thou hast brought me very low, and thou art one of them that trouble me; for I have opened my mouth to Jehovah, and I cannot go back.

³⁶And she said to him, My father, if thou hast opened thy mouth to Jehovah, do to me according to that which has proceeded out of thy mouth; forasmuch as Jehovah has taken vengeance for thee upon thine enemies, upon the children of Ammon.

³⁷And she said to her father, Let this thing be done for me: leave me alone two months, that I may go and descend to the mountains, and bewail my virginity, I and my companions.

³⁸And he said, Go. And he sent her away for two months. And she went with her companions, and bewailed her virginity upon the mountains.