'Oath' in the Bible

Therefore I swore an oath to the house of Eli, 'The sin of the house of Eli can never be forgiven by sacrifice or by grain offering.'"

Now the men of Israel were hard pressed that day, for Saul had made the army agree to this oath: "Cursed be the man who eats food before evening! I will get my vengeance on my enemies!" So no one in the army ate anything.

When the army entered the forest, they saw the honey flowing, but no one ate any of it, for the army was afraid of the oath.

But Jonathan had not heard about the oath his father had made the army take. He extended the end of his staff that was in his hand and dipped it in the honeycomb. When he ate it, his eyes gleamed.

Then someone from the army informed him, "Your father put the army under a strict oath saying, 'Cursed be the man who eats food today!' That is why the army is tired."

Saul accepted Jonathan's advice and took an oath, "As surely as the Lord lives, he will not be put to death."

Taking an oath, David again said, "Your father is very much aware of the fact that I have found favor with you, and he has thought, 'Don't let Jonathan know about this, or he will be upset.' But as surely as the Lord lives and you live, there is about one step between me and death!"

Jonathan once again took an oath with David, because he loved him. In fact Jonathan loved him as much as he did his own life.

David promised Saul this on oath. Then Saul went to his house, and David and his men went up to the stronghold.

But Saul swore an oath to her by the Lord, "As surely as the Lord lives, you will not incur guilt in this matter!"