Parallel
Judges 11:39
Jewish Publication Society 1917 · 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 had not known man. And it was a custom 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