Judges 11:31-37
English Standard Version
Chapter 11
31then whatever comes out from the doors of my house to meet me when I return in peace from the Ammonites shall be the Lord 's, and I will offer it up for a burnt offering." 32So Jephthah crossed over to the Ammonites to fight against them, and the Lord gave them into his hand. 33And he struck them from Aroer to the neighborhood of Minnith, twenty cities, and as far as Abel-keramim, with a great blow. So the Ammonites were subdued before the people of Israel.
34Then Jephthah came to his home at Mizpah. And behold, his daughter came out to meet him with tambourines and with dances. She was his only child; besides her he had neither son nor daughter.
35And as soon as he saw her, he tore his clothes and said, "Alas, my daughter! You have brought me very low, and you have become the cause of great trouble to me. For I have opened my mouth to the Lord, and I cannot take back my vow."
36And she said to him, "My father, you have opened your mouth to the Lord; do to me according to what has gone out of your mouth, now that the Lord has avenged you on your enemies, on the Ammonites."
37So she said to her father, "Let this thing be done for me: leave me alone two months, that I may go up and down on the mountains and weep for my virginity, I and my companions."
