Where did John the Baptist get the authority to baptize?
According to D&C 84: 23-28 ( http://scriptures.lds.org/en/dc/84 ), after the Melchizdek Priesthood was taken from the earth with Moses, the Aaronic Priesthood remained, even up to the time of John the Baptist. His father held the priesthood and as the oldest son of Zacharias John would also receive it. Joseph Smith said: "The Levitical Priesthood is forever hereditary – fixed on the head of Aaron and his sons forever, and was in active operation down to Zacharias the father of John" (TPJS, p. 319). John was filled with the Holy Ghost from his womb (v.27). When Mary who was carrying the unborn Savior visited Elizabeth, John leapt in her womb. John was baptized as a child (v. 28) and ordained by an angel at eight days old to become an Elias, the forerunner to the Savior. Although Zacharias was killed by Herod's soldiers, before his death he must have baptized his son and ordained his son to the Aaronic priesthood. Zacharias and Elizabeth were likely witnesses to their...