Judges 11:33-38

³³And he smote them from Aroer till one comes to Arnon, in number twenty cities, and as far as Ebelcharmim, with a very great destruction: and the children of Ammon were straitened before the children of Israel.

³⁴And Jephthae came to Massepha to his house; and behold, his daughter came forth to meet him with timbrels and dances; and she was his only child, he had not another son or daughter.

³⁵And it came to pass when he saw her, that he rent his garments, and said, Ah, ah, my daughter, thou hast indeed troubled me, and thou wast the cause of my trouble; and I have opened my mouth against thee to the Lord, and I shall not be able to return from it.

³⁶And she said to him, Father, hast thou opened thy mouth to the Lord? Do to me accordingly as the word went out of thy mouth, in that the Lord has wrought vengeance for thee on thine enemies of the children of Ammon.

³⁷And she said to her father, Let my father now do this thing: let me alone for two months, and I will go up and down on the mountains, and I will bewail my virginity, I and my companions.

³⁸And he said, Go: and he sent her away for two months; and she went, and her companions, and she bewailed her virginity on the mountains.