Mosiah 28

Jehovah

That perhaps they might bring them to the knowledge of the Lord their God, and convince them of the iniquity of their fathers; and that perhaps they might cure them of their hatred towards the Nephites, that they might also be brought to rejoice in the Lord their God, that they might become friendly to one another, and that there should be no more contentions in all the land which the Lord their God had given them. Mosiah 28:2

The missionaries want the Lamanites to know the Lord their God, Jehovah, whom Ammon and Aaron later teach as the Redeemer to come (Alma 18, 22).

How we know: Jehovah is the premortal Christ (Abraham 1:16; D&C 110:3–4)

Savior

Now they were desirous that salvation should be declared to every creature, for they could not bear that any human soul should perish; yea, even the very thoughts that any soul should endure endless torment did cause them to quake and tremble. Mosiah 28:3–4

Having felt the Savior's infinite mercy themselves, the sons of Mosiah want salvation declared to every creature, echoing Christ's charge to His apostles.

• alludes to Mark 16:15 — Go ye into all the world, and preach the gospel to every creature.

Jehovah

And the Lord said unto Mosiah: Let them go up, for many shall believe on their words, and they shall have eternal life; and I will deliver thy sons out of the hands of the Lamanites. Mosiah 28:7

Jehovah, the premortal Christ, answers Mosiah's prayer, promising eternal life to believers and protection to his sons.

How we know: Jehovah is the premortal Christ (Abraham 1:16; D&C 110:3–4)