John Gill Commentary 1 Kings 1:29

"And the king sware, and said, As Jehovah liveth, who hath redeemed my soul out of all adversity," — 1 Kings 1:29 (ASV)

And the king swore
To his former oath, he added another for greater confirmation:

and said, [as] the Lord lives ;
which was the proper form of an oath, which ought to be taken by the living God; and as what would lay him under the greater obligation to observe it, he adds,

that has redeemed my soul out of all distress ;
saved his life when in the most imminent danger; delivered him out of the hand of Goliath, and from the Philistines and other enemies, in his wars with them; and from Saul and his persecuting rage and fury, and from the rebellion of his son Absalom, and the insurrection of Sheba.