The Restoration of the Priesthood
Author: Ronald O. Barney
The claim of divinely authorized priesthood authority is the basic tenet used to set apart The Church of Jesus Christ of Latter-day Saints from other religions. Joseph Smith reported the restoration of several priesthood authorities present in the primitive churches of the Bible, including the Aaronic and Melchizadek priesthoods as well as the power to seal on earth and in heaven.
Joseph was quiet about the bestowal of these authorities, which shows his obedience in following the counsel to keep sacred things sacred. Though vague, there are reliable, contemporaneous corroboration for his claims for bestowal of these keys by angelic visitors.
Learn more about this topic in A Reason for Faith: Navigating LDS Doctrine and Church History