“For beholde, I will send you Eliiah the prophet before the comming of the great and dreadfull day of the LORD.”

Malachi 4:5 (AKJV – 1611 edition)

“Behold, I will reveal unto you the Priesthood, by the hand of Elijah the prophet, before the coming of the great and dreadful day of the Lord.”

Doctrine and Covenants – Section 2 (Salt Lake City, UT: The Church of Jesus Christ of Latter-day Saints, about 1820), verse 1.