The Doctrine and Covenants/Section 13

Ordination of Joseph Smith and Oliver Cowdery to the Aaronic Priesthood on the banks of the Susquehanna River near Harmony, Pennsylvania, May 15, 1829. History of the Church 1:39-42.

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.