Tracing the formation of the Priesthood in Mormonism is not an easy task. Dates get confused, concepts change over time, offices are added or refined, and duties are not always clearly delineated. Like all institutions, the organization was not fully formed on the first day. However, in order to get a correct understanding of how the modern LDS Church works, the history of its authoritative structure must be explained.
During the process of translating the Book of Mormon, Joseph Smith and his scribe Oliver Cowdery ran into the concept of authority to baptise. They questioned how anyone would be given the authority to baptise others. Joseph Smith stated, ““We still continued the work of translation, when, in the ensuing month (May, 1829), we on a certain day went into the woods to pray and inquire of the Lord respecting baptism for the remission of sins, that we found mentioned in the translation of the plates. While we were thus employed, praying and calling upon the Lord, a messenger from heaven descended in a cloud of light, and having laid his hands upon us, he ordained us,” to the Aaronic Priesthood (JS-H 1:68).