Judges 11:37-40
11:37 She then said to her father, “Please grant me this one wish. For two months allow me to walk through the hills with my friends and mourn my virginity.”
11:38 He said, “You may go.” He permitted her to leave for two months. She went with her friends and mourned her virginity as she walked through the hills.
11:39 After two months she returned to her father, and he did to her as he had vowed. She died a virgin. Her tragic death gave rise to a custom in Israel.
11:40 Every year Israelite women commemorate the daughter of Jephthah the Gileadite for four days.