Judges 11:37-39

37But first let me do this one thing: Let me go up and roam in the hills and weep with my friends for two months, because I will die a virgin.”

38“You may go,” Jephthah said. And he sent her away for two months. She and her friends went into the hills and wept because she would never have children.

39When she returned home, her father kept the vow he had made, and she died a virgin. So it has become a custom in Israel