Judges 11:29-40 - Jephthah Makes A Vow
29 Then the Spirit of the LORD came upon Jephthah, and he passed over Gilead, and Manasseh, and passed over Mizpeh of Gilead, and from Mizpeh of Gilead he passed over to the children of Ammon. 30 And Jephthah vowed a vow to the LORD, and said, If thou shalt without fail deliver the children of Ammon into my hands, 31 Then it shall be, that whatever cometh out of the doors of my house to meet me, when I return in peace from the children of Ammon, shall surely be the LORD'S, and I will offer it for a burnt-offering.
32 So Jephthah passed over to the children of Ammon to fight against them; and the LORD delivered them into his hands. 33 And he smote them from Aroer even till thou comest to Minnith, even twenty cities, and to the plain of the vineyards, with a very great slaughter. Thus the children of Ammon were subdued before the children of Israel.
34 And Jephthah came to Mizpeh to his house, and behold, his daughter came out to meet him with timbrels and with dances: and she was his only child; beside her he had neither son nor daughter. 35 And it came to pass, when he saw her, that he rent his clothes, and said Alas, my daughter! thou hast brought me very low, and thou art one of them that trouble me: for I have opened my mouth to the LORD, and I cannot go back.
36 And she said to him, My father, if thou hast opened thy mouth to the LORD, do to me according to that which hath proceeded out of thy mouth; forasmuch as the LORD hath taken vengeance for thee of thy enemies, even of the children of Ammon. 37 And she said to her father, Let this thing be done for me: Let me alone two months, that I may go up and down upon the mountains, and bewail my virginity, I and my fellows.
38 And he said, Go. And he sent her away for two months: and she went with her companions, and bewailed her virginity upon the mountains. 39 And it came to pass at the end of two months, that she returned to her father, who did with her according to his vow which he had vowed: and she knew no man. And it was a custom in Israel, 40 That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite four days in a year.