AN HISTORICAL REVIEW, Chapter 2 Part 1 of The Holy Priesthood Volume 1   Page 16

Old Testament Priesthood

The Priesthood came to this earth with Adam. In fact, it originated on this earth with its creation, as the Prophet Joseph Smith explained:

The Priesthood was first given to Adam; he obtained the First Presidency and held the keys of it from generation to generation. He obtained it in the Creation, before the world was formed, as in Genesis 1:26-28. He had dominion given him over every living creature. (TPJS, p. 157)

The Prophet often spoke of Adam and Priesthood rights and callings that were given to him. In another sermon the Prophet remarked:

Commencing with Adam, who was the first man, who is spoken of in Daniel as being the “Ancient of Days”, or in other words, the first and oldest of all, the great, grand progenitor of whom it is said in another place he is Michael, because he was the first and father of all, not only by progeny, but the first to hold the spiritual blessings, to whom was made known the plan of ordinances for the salvation of his posterity unto the end, and to whom Christ was first revealed, and through whom Christ has been revealed from heaven, and will continue to be revealed from henceforth. Adam holds the keys of the dispensation of the fullness of times; i.e., the dispensation of all the times have been [17] and will be revealed through him from the beginning to Christ, and from Christ to the end of the dispensations that are to be revealed. (TPJS, pp. 167-68)

http://ogdenkraut.com/?page_id=120