3 Nephi 21:26

and then shall the work of the Father commence, at that day even when this Gospel shall be preached among the remnant of this people. Verily, I say unto you, At that day shall the work of the Father commence among all the dispersed of my people; yea, even the tribes which have been lost, which the Father hath led away out of Jerusalem.

Then the Father’s work will start on that day when this good news is preached to this part of the people. I tell you the truth. On that day the Father’s work will start among all the scattered people. It will include the tribes that have been lost, which the Father led away from Jerusalem.

That’s when the Father’s work will truly begin—when this gospel is preached among the remnant of this people. I’m telling you, on that day the Father’s work will begin among all my scattered people, even the lost tribes he led away from Jerusalem.