Judges 11:36

“My father,” she replied, “you have given your word to the LORD. Do to me as you have said, for the LORD has avenged you of your enemies, the Ammonites.”

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.