'Oath' in the Bible

The men said to her, "We will be guiltless of this your oath which you have made us to swear.

But if you talk about this business of ours, then we shall be guiltless of your oath which you have made us to swear."

Joshua commanded them with an oath at that time, saying, "Cursed is the man before Yahweh, who rises up and builds this city Jericho. With the loss of his firstborn shall he lay its foundation, and with the loss of his youngest son shall he set up its gates."

This we will do to them, and let them live; lest wrath be on us, because of the oath which we swore to them."