'As the Lord Lives' in the Bible

David replied to Rechab and Baanah his brother, the sons of Rimmon the Beerothite, and said to them, “As the Lord lives, who has redeemed my life from every adversity,

Then David’s anger burned intensely against the man, and he said to Nathan, “As the Lord lives, the man who has done this deserves to die.

Then she said, “Please let the king remember the Lord your God, so that the avenger of blood will not continue to destroy, otherwise they will destroy my son.” And David said, “As the Lord lives, not a single hair [from the head] of your son shall fall to the ground.”

But Ittai answered the king, “As the Lord lives, and as my lord the king lives, most certainly wherever my lord the king may be, whether for death or life, there will your servant be also.”