Jesus Christ
Jesus (Yeshua) — Jehovah saves; Christ — the Anointed One
Thus saith the Lord your God, even Jesus Christ, the Great I AM, Alpha and Omega, the beginning and the end, the same which looked upon the wide expanse of eternity, and all the seraphic hosts of heaven, before the world was made; Doctrine and Covenants 38:1
The speaker names Himself outright: 'the Lord your God' of this revelation is Jesus Christ. That tells us who is talking in every verse that follows.
How we know: the verse itself names Him · the chapter heading names Him · a footnote points to Him · a Church study aid lists it
