39 After the two months, she returned to her father, and he did to her as he had vowed. And she was a virgin.

From this comes the Israelite tradition

39 And at the end of two months, she returned to her father, who did with her according to his vow that he had made. She had never known a man, and it became a custom in Israel

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,

39 When she returned home, her father kept the vow he had made, and she died a virgin.

So it has become a custom in Israel

39 And it was so at the end of two months that she returned to her father, and he carried out his vow with her which he had vowed. She knew no man.

And it became a custom in Israel

39 After two months she returned to her father, and Jephthah did to her what he had promised. Jephthah’s daughter never had a husband.

From this came a custom in Israel that

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 not man. And it was a custom in Israel,

39 And it came to pass at the end of two months, that she returned to her father, and he performed on her the vow that he had vowed; and she had known no man. And it became a fixed custom in Israel,

39 At the end of those two months she came back to her father. He did to her what he had vowed, and she never had a husband. So the custom began in Israel

39 At the end of two months, she returned to her father, and he kept the vow he had made about her. And she had never been intimate with a man. Now it became a custom in Israel

39 At the end of two months, she returned to her father, who did with her according to the vow he had made. She had never slept with a man. So there arose an Israelite custom that

39 At the end of the two months she returned to her father, and he did to her according to his vow; and she did not sleep with a man. And it became an annual custom in Israel

39 After the two months were over, she returned to her father. He did to her just what he had promised to do. And she was a virgin.

So that became a practice in Israel.