'As Your Soul Lives' in the Bible

And Elijah said to Elisha, “Please stay here, for the Lord has sent me to Bethel.” But Elisha replied, “As the Lord lives and as your soul lives, I will not leave you.” So they went down to Bethel.

Elijah said to him, “Elisha, please stay here, for the Lord has sent me to Jericho.” But he said, “As the Lord lives and as your soul lives, I will not leave you.” So they came to Jericho.

Elijah said to him, “Please stay here, for the Lord has sent me to the Jordan.” But he said, “As the Lord lives and as your soul lives, I will not leave you.” So the two of them went on.

Then the mother of the boy said, "{As Yahweh lives} and {as your soul lives}, I will surely not leave you." So he got up and went after her.