All things bear record · Doctrine and Covenants
2 witnesses of Christ here, and 5 further echoes from the reading.
Verily I say unto you who have assembled yourselves together that you may learn my will concerning the redemption of mine afflicted people— Doctrine and Covenants 105:1–6
The Lord speaks as Zion's Redeemer who wants to receive His people to Himself, but they must first live the celestial law; they learn obedience by the things they suffer, as He did.
Jehovah — the premortal and resurrected Lord Jesus Christ who speaks the revelations
And this cannot be brought to pass until mine elders are endowed with power from on high. Doctrine and Covenants 105:11–12
The Savior promises power from on high, the same promise He gave His Apostles before Pentecost, fulfilled in the Kirtland Temple where He appeared.
Jehovah — the Lord of hosts who fights for Israel
For behold, I do not require at their hands to fight the battles of Zion; for, as I said in a former commandment, even so will I fulfil—I will fight your battles. Doctrine and Covenants 105:14–15
As Jehovah fought for ancient Israel, the Lord Jesus Christ promises to fight Zion's battles for His Saints.
Jehovah — the God of the Exodus, the premortal Christ
And I will soften the hearts of the people, as I did the heart of Pharaoh, from time to time, until my servant Joseph Smith, Jun., and mine elders, whom I have appointed, shall have time to gather up the strength of my house, Doctrine and Covenants 105:27
The speaker identifies Himself as the same Lord who dealt with Pharaoh in the Exodus — Jehovah, the premortal Christ.
Christ — the Anointed One
But first let my army become very great, and let it be sanctified before me, that it may become fair as the sun, and clear as the moon, and that her banners may be terrible unto all nations; Doctrine and Covenants 105:31–32
Zion is named as the kingdom of God and His Christ; one day all nations will acknowledge that Jesus Christ reigns.
How we know: the verse itself names Him
Verily I say unto you, it is expedient in me that the first elders of my church should receive their endowment from on high in my house, which I have commanded to be built unto my name in the land of Kirtland. Doctrine and Covenants 105:33
The Kirtland Temple is the Savior's house, built to His name, where He would endow His servants.
Therefore, be faithful; and behold, and lo, I am with you even unto the end. Even so. Amen. Doctrine and Covenants 105:41
The Savior closes with the same promise He gave His Apostles after His Resurrection: He will stay with His disciples to the end.
How we know: the verse itself names Him