'Oath' in the Bible

The men of Israel were hard pressed on that day, and Saul required the army to take an oath: "Cursed is the person who eats food before evening and before I've been avenged of my enemies." So no one tasted food.

The people came into the woods and there was flowing honey, but no one put his hand to his mouth to eat it because the people were afraid due to the oath.

But Jonathan had not heard that his father had required the army to swear an oath, so he stretched out the end of the staff that was in his hand and dipped it in the honeycomb. He brought it back to his mouth and his eyes brightened.

Then one of the people responded: "Your father strictly ordered the army to take an oath. That's why he said, "Cursed is the person who eats food today,' and so the army is exhausted."

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."