Judges 11:29-37

Now the Spirit of the LORD came upon Jephthah, so that he passed through Gilead and Manasseh; then he passed through Mizpah of Gilead, and from Mizpah of Gilead he went on to the sons of Ammon. Jephthah made a vow to the LORD and said, “If You will indeed give the sons of Ammon into my hand, then it shall be that whatever comes out of the doors of my house to meet me when I return in peace from the sons of Ammon, it shall be the LORD’S, and I will offer it up as a burnt offering.” So Jephthah crossed over to the sons of Ammon to fight against them; and the LORD gave them into his hand. He struck them with a very great slaughter from Aroer to the entrance of Minnith, twenty cities, and as far as Abel-keramim. So the sons of Ammon were subdued before the sons of Israel. When Jephthah came to his house at Mizpah, behold, his daughter was coming out to meet him with tambourines and with dancing. Now she was his one and only child; besides her he had no son or daughter. When he saw her, he tore his clothes and said, “Alas, my daughter! You have brought me very low, and you are among those who trouble me; for I have given my word to the LORD, and I cannot take it back.” So she said to him, “My father, you have given your word to the LORD; do to me as you have said, since the LORD has avenged you of your enemies, the sons of Ammon.” She said to her father, “Let this thing be done for me; let me alone two months, that I may go to the mountains and weep because of my virginity, I and my companions.”