All things bear record · 3 Nephi

3 Nephi 6

3 witnesses of Christ here.

Resurrection of Christ

And there began to be men inspired from heaven and sent forth, standing among the people in all the land, preaching and testifying boldly of the sins and iniquities of the people, and testifying unto them concerning the redemption which the Lord would make for his people, or in other words, the resurrection of Christ; and they did testify boldly of his death and sufferings. 3 Nephi 6:20

Men inspired from heaven prophesy of the redemption the Lord would make, and Mormon explains that this means the Resurrection of Christ. The verse itself equates 'the Lord' who redeems with Christ.

AttestedExplicitA prophecy of Hima messenger speaking for Him

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

Death and sufferings of Christ

And there began to be men inspired from heaven and sent forth, standing among the people in all the land, preaching and testifying boldly of the sins and iniquities of the people, and testifying unto them concerning the redemption which the Lord would make for his people, or in other words, the resurrection of Christ; and they did testify boldly of his death and sufferings. 3 Nephi 6:20

The prophets also testify boldly that Christ will suffer and die. Within a few years this is fulfilled, and the Nephites see the signs of His death (3 Nephi 8).

AttestedExplicitA prophecy of Hima messenger speaking for Him

How we know: a footnote points to Him · a Church study aid lists it

Christ

Christ — the Anointed One

Now there were many of those who testified of the things pertaining to Christ who testified boldly, who were taken and put to death secretly by the judges, that the knowledge of their death came not unto the governor of the land until after their death. 3 Nephi 6:23

Witnesses of Christ are secretly executed for their testimony. Like the prophets before them, they are killed for testifying of Him, a pattern that Christ Himself will suffer.

AttestedExplicitnamea messenger speaking for Him

How we know: the verse itself names Him