Judges 11:36 in the World English Bible
She said to him, “My father, you have opened your mouth to the LORD; do to me according to that which has proceeded out of your mouth, because the LORD has taken vengeance for you on your enemies, even on the children of Ammon.”
Context
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 unto the LORD, and I cannot go back.
36 And she said unto him, My father, if thou hast opened thy mouth unto 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 thine enemies, even of the children of Ammon.
37 And she said unto 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.