Judges 11:34-40 - Jephthah's Daughter
34 And Jephthah will come to Mizpeh to his house, and behold, his daughter will come forth to his meeting with drums and with lutes: and she the only begotten; not to him beside her, son nor daughter. 35 And it will be when he saw her, and he will tear his garments, and will say, Alas, my daughter bowing down, thou didst bow me down, and thou art in my trouble: and I opened my mouth to Jehovah, and I shall not be able to turn back.
36 And she will say to him, My father, opening thy mouth to Jehovah, do to me acording to what came forth from thy mouth, after that Jehovah did for thee vengeance of thine enemies, of the sons of Ammon. 37 And she will say to her father, This word shall be done to me: desist from me two months, and I will go, and go down upon the mountains, and I will lament over my virginity, I and my friends.
38 And he will say, Go. And he will send her away two months: and she will go and her friends, and she will lament over her virginity upon the mountains. 39 And it will be from the end of two months, and she will turn back to her father and he will do to her his vow which he vowed: and she knew not man. And it will be a law in Israel, 40 From days of days the daughters of Israel will go to celebrate to the daughter of Jephthah the Gileadite, four days in the year.