'Vow' in the Bible

Jephthah made this solemn vow to the LORD: "If you truly give the Ammonites into my control,

Now the people of Israel had taken a vow in Mizpah that went like this: "Not even one of us will give his daughter in marriage to a descendant of Benjamin!"

But we can't give them wives from our own daughters, since we've taken this vow: "May the LORD curse anyone who gives his daughter as a wife to the tribe of Benjamin!'"