Judges 11:39

39After 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

39And at the end of two months she returned to her father, who did to her 11:39 Lit his vow which he had vowedwhat he had vowed; and she 11:39 Lit knew no manhad no relations with a man. And it became a custom in Israel,

39At the end of two months she returned to her father, who did to her according to the vow which he had made; and she had no relations with a man. Thus it became a custom in Israel,

39At the end of two months she returned to her father, who did to her as he had vowed; and she had no relations with a man. It became a custom in Israel,

39After 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

39After 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.