Doctrine and Covenants Section 13

This "revelation" was first published in the Times & Seasons in 1842, 13 years after the event allegedly occurred, and back dated to May 15, 1829. It was canonized in the Doctrine & Covenants in 1876.

Ordination of Joseph Smith and Oliver Cowdery to the Aaronic Priesthood along the bank of the Susquehanna River, near Harmony, Pennsylvania, May 15, 1829. HC 1: 39–42. The ordination was done by the hands of an angel, who announced himself as John, the same that is called John the Baptist in the New Testament. The angel explained that he was acting under the direction of Peter, James, and John, the ancient apostles, who held the keys of the higher priesthood, which was called the Priesthood of Melchizedek. The promise was given to Joseph and Oliver that in due time the Priesthood of Melchizedek would be conferred upon them.

1 Upon you my fellow servants, in the name of Messiah I confer the Priesthood of Aaron, which holds the keys of the ministering of angels, and of the gospel of repentance, and of baptism by immersion for the remission of sins; and this shall never be taken again from the earth, until the sons of Levi do offer again an offering unto the Lord in righteousness.

There is no record that Joseph Smith or Oliver Cowdery received the Melchizedek priesthood:

The promise to confer upon Joseph and Oliver the Melchisedek Priesthood was fulfilled; but as there is no definite account of the event in the history of the Prophet Joseph, or, for matter of that, in any of our annals.

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B. H. Roberts - Mormon Seventy and LDS church historian
History of the Church 1:40

See Priesthood

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