The offering of sacrifice has ever been connected and forms a part of the duties of the Priesthood. . . .
These sacrifices, as well as every ordinance belonging to the Priesthood, will, when the Temple of the Lord shall be built, and the sons of Levi be purified, be fully restored and attended to in all their powers, ramifications, and blessings.
(Joseph Smith, Teachings of the Prophet Joseph Smith, p. 172-73)