From Historia di Jephte by Giacomo Carissimi. See Judges 11:34-39 (NIV)... 34. When Jephthah returned to his home in Muzpah, who should come out to meet him but his daughter, danceing to the sound of timbrels! Shw eas an only child. Except for her he had neither son nor daughter. 35. When he saw her, he tore his clothes and cried, "Oh! My daughter! You have brought me down and I am devastated. I have made a vow to the Lord that I cannot break." 36. "My father," she replied, "you have given your word to the Lord. Do to me just as you promised, now that the Lord has avenged you of your enemies, the Ammonites. 37. But grant me this one request," she said. "Give me two months to roam the hills and weep with my friends, because I will never marry." 38. "You may go," he said. And he let her go for two months. She and her friends went into the hills and wept because she would never marry. 39. After the two months, she returned to her father, and he did to her as he had vowed. And she was a virgin.

Plorate filii Israel, plorate omnes virgines et filiam Jephte unigenitam in carmine doloris, doloris lamentamini. (Translation) Weep, sons of Israel; weep, all virgins, and Jephtha's only daughter lament in songs of sorrow.