Judges:11:38-40
kjv@Judges:11:38 @ And he said, Go. And he sent her away for two months: and she went with her companions, and bewailed her virginity upon the mountains.
kjv@Judges:11:39 @ And it came to pass at the end of two months, that she returned unto 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,
kjv@Judges:11:40 @ That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite four days in a year.