Judges 11:36-37

36“My father, you have opened your mouth to Adonai,” she said to him. “Do to me what proceeded from your mouth—since Adonai brought vengeance on your enemies, the children of Ammon.”

37She said further to her father, “Let this thing be done for me. Let me be alone two months, so that I may go on the mountains and mourn my virginity, I and my companions.”