Parallel
Judges 11:39
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
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 (note: Or, ordinance) in Israel,
After two months, she returned to her father, and he did to her as he had vowed. And she had never had relations with a man. So it has become a custom in Israel