“And now, after the many testimonies which have been given of him, this is the testimony, last of all, which [I] give of him: That he lives!” – D&C 76:22.
Also see:
We can also learn from Matthew 27:52-53 about the first people to be resurrected after Christ (Also see Doctrine and Covenants Section 138). “And the graves were opened; and many bodies of the saints which slept arose, And came out of the graves after his resurrection, and went into the holy city, and appeared unto many.”