Acts 1 & 2

Luke writes that Jesus taught his disciples -

"To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God..." (New Testament Acts 1:3)

But after his ascension -

"....he through the Holy Ghost had given commandments unto the apostles whom he had chosen..." (New Testament Acts 1:2)

It is significant here how his apostles continued to administer His Church in that His apostles continued to receive his teachings and commandments by revelation through the Holy Ghost. But not only teachings and commandments by revelation but also the spirit of prophecy or testimony through the Holy Ghost as the Savior said -

"...ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judæa, and in Samaria, and unto the uttermost part of the earth." (New Testament Acts 1:8)

This witness to be -

"...of thy brethren that have the testimony of Jesus: worship God: for the testimony of Jesus is the spirit of prophecy." (New Testament Revelation 19:10)

These Church leaders now understood how they were to call others to serve of God by revelation from the Holy Ghost as -

"...they prayed, and said, Thou, Lord, which knowest the hearts of all men, shew whether of these two thou hast chosen..." (New Testament Acts 1:24)

The Holy Ghost, the Spirit of Revelation, was not only to be had by the apostles but as for a witness to all if Christ and his mission. As the apostles spoke to those of many nations dwelling in Jerusalem, as they -

"...they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance." (New Testament Acts 2:4)

Those of many nations -

"...were all amazed and marvelled, saying one to another, Behold, are not all these which speak Galilæans?
8 And how hear we every man in our own tongue, wherein we were born?" (New Testament Acts 2:7 - 8)

Peter goes on to teach the words of the Prophet Joel -

"...it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams:
18 And on my servants and on my handmaidens I will pour out in those days of my Spirit; and they shall prophesy..." (New Testament Acts 2:17 - 18)

In other words, those that live worthily to receive the Spirit, will receive through the Holy Ghost a witness as Peter testified of -

"...the Holy Ghost, whom God hath given to them that obey him." (New Testament Acts 5:32)

And of those that receive the Holy Ghost will be able to bear testimony that Jesus is the Christ and this is His Kingdom on the Earth, as was promised -

"For John truly baptized with water; but ye shall be baptized with the Holy Ghost..." (New Testament Acts 1:5)

For it is through the Holy Ghost that -

"...he will manifest the truth of it unto you...And by the power of the Holy Ghost ye may know the truth of all things." (Book of Mormon Moroni 10:4 - 5)