'Surely' in the Bible

As surely as the Lord lives who saves Israel, even if it is because of my son Jonathan, he must die!” Not one of the troops answered him.

When Saul had seen David going out to confront the Philistine, he asked Abner the commander of the army, “Whose son is this youth, Abner?”“My king, as surely as you live, I don’t know,” Abner replied.

Saul listened to Jonathan’s advice and swore an oath: “As surely as the Lord lives, David will not be killed.”

But David said, “Your father certainly knows that you have come to look favorably on me. He has said, ‘Jonathan must not know of this, or else he will be grieved.’” David also swore, “As surely as the Lord lives and as you yourself live, there is but a step between me and death.”

Now my lord, as surely as the Lord lives and as you yourself live, it is the Lord who kept you from participating in bloodshed and avenging yourself by your own hand. May your enemies and those who want trouble for my lord be like Nabal.

Otherwise, as surely as the Lord God of Israel lives, who prevented me from harming you, if you had not come quickly to meet me, Nabal wouldn’t have had any men left by morning light.”

But the woman said to him, “You surely know what Saul has done, how he has killed the mediums and spiritists in the land. Why are you setting a trap for me to get me killed?”

Then Saul swore to her by the Lord: “As surely as the Lord lives, nothing bad will happen to you because of this.”