'Oath' in the Bible

Now the men of Israel were hard pressed on that day, because Saul had made the army take an oath, saying, "Cursed be the man who eats [any] food until evening, when I will have avenged myself on my enemies!" So none of the army tasted [any] food.

When the army came to the forest, look! [There was] honey flowing, but no one put his hand to his mouth, for the army was afraid of the solemn oath.

However, Jonathan had not heard about the oath of his father with the army, so he extended the end of the staff which was in his hand, and he dipped it into the honeycomb. Then he put his hand to his mouth and his eyes gleamed.

Then a man from the army informed [him] and said, "Your father made the army swear a solemn [oath], saying, 'Cursed be the man who eats food today,'" so the army [is] exhausted.

Then David {took an oath} again and said, "Your father knows very well that I have found favor in your eyes, and he thought, 'Do not let Jonathan know this, lest he worry.' But {as Yahweh lives} and {as your soul lives}, surely [there is] merely a step between me and death!"

And Jonathan again made David swear an oath, because he loved him; for with the love of his soul he loved him.

Jonathan said to David, "Go in peace, because we have sworn, the two of us, [an oath] in the name of Yahweh, saying, "Yahweh will be between me and you, and between my offspring and your offspring forever." Then he got up and left, and Jonathan went into the city.

So David swore [this on oath] to Saul, and Saul went to his house, but David and his men went up to the stronghold.