'As Your Soul Lives' in the Bible

She said, “Oh, my lord! As your soul lives, my lord, I am the woman who stood here beside you, praying to the Lord.

Yet David vowed again, saying, “Your father knows well that I have found favor in your sight, and he has said, ‘Do not let Jonathan know this, or he will be grieved.’ But truly as the Lord lives and as your soul lives, there is hardly a step between me and death.”

“Now therefore, my lord, as the Lord lives, and as your soul lives, since the Lord has restrained you from shedding blood, and from avenging yourself by your own hand, now then let your enemies and those who seek evil against my lord, be as Nabal.

So the king said, “Is the hand of Joab with you in all this?” And the woman replied, “As your soul lives, my lord the king, no one can turn to the right or to the left from anything that my lord the king has spoken. Indeed, it was your servant Joab who commanded me, and it was he who put all these words in the mouth of your maidservant;