Judges 11:38

American Standard Version

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.

Judges 11:38 in other translations

He said, “Go.” He sent her away for two months; and she departed, she and her companions, and mourned her virginity on the mountains.

36And she said unto him, My father, thou hast opened thy mouth unto Jehovah; do unto me according to that which hath proceeded out of thy mouth, forasmuch as Jehovah hath taken vengeance for thee on thine enemies, even on the children of Ammon.
37And she said unto 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.
38And 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.
39And 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 not man. And it was a custom in Israel,
40that the daughters of Israel went yearly to celebrate the daughter of Jephthah the Gileadite four days in a year.