In the Latter Day Saint movement, the second anointing, also known historically and in Latter Day Saint scripture as the fulness of the priesthood, is an obscure and relatively rare ordinance usually conducted in temples as an extension of the Nauvoo endowment ceremony. Founder Joseph Smith cited the "fulness of the priesthood" as one of the reasons for building the Nauvoo Temple. In the ordinance, a participant is anointed as a "priest and king" or a "priestess and queen", and is sealed to the highest degree of salvation available in Mormon theology. Those who participate in this ordinance are said to have their "calling and election made sure", and their celestial marriage "sealed by the holy spirit of promise". They are said to have received the "more sure word of prophecy".
The Church of Jesus Christ of Latter-day Saints (LDS Church), the largest Latter Day Saint denomination, performed the ceremony for nominated couples from the 1840s and is believed to be still performed today. Current official information about the practice by that denomination, or whether the ordinance is still in use, has not been made public. The ordinance is also performed by many Mormon fundamentalist groups. However, it is not performed by denominations, such as the Community of Christ, who historically never practiced the Nauvoo endowment ceremony.
Although Joseph Smith introduced the Nauvoo endowment in 1842, he came to understand that his work in establishing the "fullness of the priesthood" was not yet complete. In August 1843, church apostle Brigham Young stated that "[i]f any in the Church had the fullness of the priesthood, he did not know it". Young understood that the "fullness of the priesthood" involved an anointing as "king and priest", with the actual kingdom to be given after resurrection.