Jehovah
As for me, this is my covenant with them, saith the LORD; My spirit that is upon thee, and my words which I have put in thy mouth, shall not depart out of thy mouth, nor out of the mouth of thy seed, nor out of the mouth of thy seed’s seed, saith the LORD, from henceforth and for ever. Isaiah 59:21
The Lord covenants that His Spirit and His words will stay with His people and their descendants forever. Paul reads this covenant together with the coming of the Deliverer.
AttestedJehovah — the LORDHe speaks in the first person
How we know: the chapter heading names Him
- quoted by Romans 11:27 — 'For this is my covenant unto them.'