Judges 11:31, 39

then it shall be, that whatsoever cometh forth from the doors of my house to meet me, when I return in peace from the children of Ammon, it shall be Jehovah’s, and I will offer it up for a burnt-offering.

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