'Oath' in the Bible

And the men said unto her, We will be guiltless of this thine oath which thou hast made us to swear.

But if thou utter this our business, then we shall be guiltless of thine oath which thou hast made us to swear.

And Joshua charged them with an oath at that time, saying, Cursed be the man before Jehovah, that riseth up and buildeth this city Jericho: with the loss of his first-born shall he lay the foundation thereof, and with the loss of his youngest son shall he set up the gates of it.

This we will do to them, and let them live; lest wrath be upon us, because of the oath which we sware unto them.