The Spirit of Elijah
"Joseph compared Moroni’s teaching to a similar prophecy by Malachi—that Elijah would come again. 10 We know that Elijah did return—at least twice—after Malachi’s promise. At Christ’s transfiguration, Elijah appeared on the mount to Peter, James, and John. 11 At the Kirtland Temple, April 3, 1836, Elijah appeared to the Prophet and Oliver Cowdery and said, “The keys of this dispensation are committed into your hands."
The Hearts of the Children Shall Turn
"Elder Russell M. Nelson has taught that the Spirit of Elijah is “a manifestation of the Holy Ghost bearing witness of the divine nature of the family” (“A New Harvest Time,” Ensign, May 1998, 34). This distinctive influence of the Holy Ghost draws people to identify, document, and cherish their ancestors and family members—both past and present.
"The Spirit of Elijah affects people inside and outside of the Church. However, as members of Christ’s restored Church, we have the covenant responsibility to search out our ancestors and provide for them the saving ordinances of the gospel. “They without us should not be made perfect” (Hebrews 11:40; see also Teachings: Joseph Smith, 475). And “neither can we without our dead be made perfect” (D&C 128:15)."
Learning the Doctrine
"I testify that the spirit of Elijah is touching the hearts of many of Father’s children throughout the world, causing the work for the dead to accelerate at an unprecedented pace."
After the Fire a Still Small Voice
"I wish you to understand this subject, for it is important; and if you receive it, this is the spirit of Elijah, that we redeem our dead, and connect ourselves with our fathers which are in heaven, and seal up our dead to come forth in the first resurrection; and here we want the power of Elijah to seal those who dwell on earth to those who dwell in heaven. This is the power of Elijah and the keys of the kingdom of Jehovah” (Teachings of the Prophet Joseph Smith, sel. Joseph Fielding Smith , 337–38)."