Reference for Judges 11:39

וַיְהִ֞י מִקֵּ֣ץ ׀ שְׁנַ֣יִם חֳדָשִׁ֗ים וַתָּ֙שָׁב֙ אֶל־אָבִ֔יהָ וַיַּ֣עַשׂ לָ֔הּ אֶת־נִדְר֖וֹ אֲשֶׁ֣ר נָדָ֑ר וְהִיא֙ לֹא־יָדְעָ֣ה אִ֔ישׁ וַתְּהִי־חֹ֖ק בְּיִשְׂרָאֵֽל׃

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,