Acts 8

As the apostles called seven worthy men to assist in the work, we are told -

"...they chose Stephen, a man full of faith and of the Holy Ghost, and Philip, and Prochorus, and Nicanor, and Timon, and Parmenas, and Nicolas a proselyte of Antioch:
6 Whom they set before the apostles: and when they had prayed, they laid their hands on them."  (New Testament | Acts 6:5 - 6)

It becomes apparent that the apostles had been given authority in order to lay hands on them.  Obviously, priesthood authority to call and set them apart in the work.

Sometime later, Philip -

"...Philip went down to the city of Samaria, and preached Christ unto them.
6 And the people with one accord gave heed unto those things which Philip spake, hearing and seeing the miracles which he did.
7 For unclean spirits, crying with loud voice, came out of many that were possessed with them: and many taken with palsies, and that were lame, were healed."  (New Testament | Acts 8:5 - 7)

For -

"...when they believed Philip preaching the things concerning the kingdom of God, and the name of Jesus Christ, they were baptized, both men and women."  (New Testament | Acts 8:12)

It is apparent in my mind that Philip also held priesthood authority to baptize just like John the Baptist. We then read that after these Samaritans had been baptized -

"Now when the apostles which were at Jerusalem heard that Samaria had received the word of God, they sent unto them Peter and John:
15 Who, when they were come down, prayed for them, that they might receive the Holy Ghost:
16 (For as yet he was fallen upon none of them: only they were baptized in the name of the Lord Jesus.)
17 Then laid they their hands on them, and they received the Holy Ghost."  (New Testament | Acts 8:14 - 17)

It now becomes apparent that Phillip held a lessor priesthood and Peter and John held a higher priesthood that had authority to give the Gift of the Holy Ghost.  Simon, a sorcerer, also recognized this priesthood authority and even suggested -

"...Give me also this power, that on whomsoever I lay hands, he may receive the Holy Ghost.
20 But Peter said unto him, Thy money perish with thee, because thou hast thought that the gift of God may be purchased with money."  (New Testament | Acts 8:19 - 20)

Obviously, not anyone can hold either of these priesthoods.  One of the articles of our faith in include -

"We believe that a man must be called of God, by prophecy, and by the laying on of hands by those who are in authority, to preach the Gospel and administer in the ordinances thereof."  (Pearl of Great Price | Articles of Faith 1:5)