CLICK HERE to read 3 Nephi 21.
In the last chapter, the Savior explained the covenant that our Father would gather us, and we would be His people. In this chapter, He says that this will begin when the full gospel is restored and the Book of Mormon comes forth (verses 2-3). The Book of Mormon is the sign of that covenant (verses 1, 7). For that to happen, a free people must be established in the land by the power of the Father (verse 4).
A lot will happen, the Savior says, between the time of you believing Nephites witnessing these things this day, and in the future as your children’s children will “dwindle in unbelief because of iniquity” (verse 5). But if the people “will not harden their hearts, that they may repent and come unto me and be baptized in my name and know of the true points of my doctrine”, then they will be counted as His People, the People of Holiness (verse 6). His people will then be in danger at times, but He will heal them according to His wisdom (verse 10).
When these scriptures come forth, many will be silenced because they will understand what they did not recognize before, and consider what they they did not know before (verse 8). Those who do believe will be delivered (verses 12-13).
This will be “a great and a marvelous work”, even though many will not believe despite being told about it (verse 9). Those who do not believe it will be cut off, or separated, from those who do believe (verse 11). These who will not repent will be destroyed (verse 14), or cut off from their families, those things that made their life seem live-able (verse 15), false worship (verse 16), and illusions of independence (verse 17). What sustained them before will be taken away (verse 18), and all evil will be destroyed (verse 19). Those who will not repent will be cut off (verse 20) in fury even worse than those without God (verse 21).
But those who will repent and hearken unto His words with soft hearts will be established as His people, under His authority and in His Order (verse 22). They will build the New Jerusalem (verse 23) and assist in the work of gathering in the people (verse 24), even through the work done in Temples.
Then shall the power of heaven come down among them;
and I also will be in their midst (verse 25).
The the work of the Father keeping His covenant of gathering His people will begin (verse 26). He will gather His people through temples, which provide the way by which “they may call on the Father in my name” (verse 27) and the way of gathering all the people home, organized according to their inheritance (families) (verse 28). This is His work, and He will lead the way and complete the task as He promised (verse 29).