'Took an Oath' in the Bible

David again took an oath: "Your father certainly knows that I've found favor with you, and so he told himself, "Jonathan must not know this so he won't be upset.' But as certainly as the LORD is alive and living, and as certainly as I'm alive and living, too, there is only a step between me and death."

Then all the people cried again because of him. Everyone tried to persuade David to have a meal while there was still daylight, but David took an oath by saying, "May God to do like this to me and more, if I taste bread or anything else before the sun sets!"

The LORD took an oath and will never recant: "You are a priest forever, after the manner of Melchizedek."

In the morning, the Jewish leaders formed a conspiracy and took an oath not to eat or drink anything before they had killed Paul.