C. F. Keil and Franz Delitzsch on 1 Kings 1:28-30

1Ki 1:28-30

The king then sent for Bathsheba again, and gave her this promise on oath: “As truly as Jehovah liveth, who hath redeemed my soul out of all distress (as in 2Sa 4:9), yea, as I swore to thee by Jehovah, the God of Israel, saying, Solomon thy son shall be king after me, ... yea, so shall I do this day.” The first and third כּי serve to give emphasis to the assertion, like imo, yea (cf. Ewald, §330, b.). The second merely serves as an introduction to the words.