Judges 11:31-35

then whatever comes out the doors of my house to meet me when I return safely 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 handed them over to him.

He inflicted a very great defeat on them 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.

But Jephthah came to his house at Mizpah, and behold, his daughter was coming out to meet him with tambourines and with dancing. And she was his one and only child; besides her he had no son or daughter.

So when he saw her, he tore his clothes and said, “Oh, my daughter! You have brought me disaster, and you are among those who trouble me; for I have given my word to the Lord, and I cannot take it back.”