'As the Lord Lives' in the Bible

David replied to Recab and his brother Baanah, the sons of Rimmon the Beerothite, "As surely as the Lord lives, who has delivered my life from all adversity,

Then David became very angry at this man. He said to Nathan, "As surely as the Lord lives, the man who did this deserves to die!

She replied, "In that case, let the king invoke the name of the Lord your God so that the avenger of blood may not kill! Then they will not destroy my son!" He replied, "As surely as the Lord lives, not a single hair of your son's head will fall to the ground."

But Ittai replied to the king, "As surely as the Lord lives and as my lord the king lives, wherever my lord the king is, whether dead or alive, there I will be as well!"