The Prophet Elijah
Bible Dictionary in the Latter-day Saint edition of the King James Version of the Bible, “Elijah”
“[Elijah’s] recorded words are few but forceful, and his deeds are explicit evidences of his strength of will, force of character, and personal courage. He was an example of solid faith in the Lord. . . .
“We learn from latter-day revelation that Elijah held the sealing power of the Melchizedek Priesthood. He appeared on the Mount of Transfiguration in company with Moses (also translated) and conferred the keys of the priesthood on Peter, James, and John (Matt. 17:3). He appeared again, in company with Moses and others, on April 3, 1836, in the Kirtland (Ohio) Temple and conferred the same keys upon Joseph Smith and Oliver Cowdery. All of this was in preparation for the coming of the Lord, as spoken of in Mal. 4:5–6 (D&C 110:13–16).”
(Bible Dictionary, “Elijah”)