As thy soul liveth - This oath is unique to the Books of Samuel, in which it occurs six times, and to the Books of Kings, in which however, it is found only once. See the note to 1 Samuel 1:11.
Related Commentaries of 1 Samuel 1:26
1 Samuel 1:26
26 And she said, Oh my lord, as thy soul liveth, my lord, I am the woman that stood by thee here, praying unto the LORD.