'As the Lord Lives' in the Bible

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

Then David’s anger burned greatly against the man, and he said to Nathan, “As the Lord lives, surely 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 he said, “As the Lord lives, not one hair of your son shall fall to the ground.”

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