Helaman 6

2 witnesses of Christ here.

The Lamb

The Lamb — the sinless sacrifice slain for the world

Yea, and many did preach with exceedingly great power and authority, unto the bringing down many of them into the depths of humility, to be the humble followers of God and the Lamb. Helaman 6:5

Lamanite converts preach with such power that proud Nephites are humbled into becoming followers of God and the Lamb. 'The Lamb' is Jesus Christ, the sacrifice every Passover lamb pointed toward.

AttestedExplicitA title of Christ

How we know: the verse itself names Him · a Church study aid lists it

the same title in John 1:29 — Behold the Lamb of God, which taketh away the sin of the world.
the same title in 1 Nephi 13:40 — The Lamb of God is the Son of the Eternal Father, and the Savior of the world.
alludes to Revelation 14:4 — These are they which follow the Lamb whithersoever he goeth.

The Lord who led Israel to promised lands

Jehovah — the covenant God of Israel

Now the land south was called Lehi, and the land north was called Mulek, which was after the son of Zedekiah; for the Lord did bring Mulek into the land north, and Lehi into the land south. Helaman 6:10

The Lord who brought both Mulek's and Lehi's companies from Jerusalem to their promised lands is the covenant God of Israel. The Book of Mormon teaches that this God who led their fathers is the one who would come as Jesus Christ.

AttestedJehovah — the LORDA divine name

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

the same event in Omni 1:15-16 — The people of Zarahemla came from Jerusalem when Zedekiah was taken, brought by the hand of the Lord.
alludes to 1 Nephi 2:20 — Ye shall be led to a land of promise.
interpreted by 1 Nephi 19:10 — The God of Abraham, Isaac, and Jacob, who led Israel out of Egypt, yields himself to be crucified.