Judges 11:28-32

But the king of the sons of Ammon disregarded the message which Jephthah sent him. Jephthah’s Tragic Vow

Now the Spirit of the Lord came upon Jephthah, and 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.

And Jephthah made a vow to the Lord and said, “If You will indeed hand over to me the sons of Ammon,

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.