'Swore' in the Bible

Saul listened to Jonathan, and swore by the life of the LORD that David would not be killed.

Jonathan told David, "Go in peace since both of us swore in the name of the LORD: "May the LORD be between me and you, and between my descendants and your descendants forever.'" Then David got up and left, while Jonathan went to the city.

Saul swore to her by the LORD: "As surely as the LORD lives, no punishment will come on you for this thing."