'As You Live' in the Bible

When Saul saw David going out to meet the Philistine, he asked Abner, the commander of the army, "Whose son is this young man, Abner?" Abner said, "As surely as you live, your majesty, I don't know."

Now, your majesty, as the LORD lives and as you live, the LORD has kept you from shedding blood and from delivering yourself by your own actions. Now, may your enemies and those seeking to do evil to your majesty be like Nabal.