'Took an Oath' in the Bible
And Jephthah took an oath to the Lord, and said, If you will give the children of Ammon into my hands,
And he said to his mother, The eleven hundred shekels of silver which were taken from you, about which you took an oath and said in my hearing, I have given this silver to the Lord from my hand for myself, to make a pictured image and a metal image: see, I have the silver, for I took it: so now I will give it back to you. And his mother said, May the blessing of the Lord be on my son.
How can we find wives for those who are left? After all, we took an oath in the Lord's name not to give them our daughters as wives."