The Holy Spirit is poured out and the gospel spreads to the nations.
The story
At Pentecost the Spirit comes upon the disciples and three thousand believe. The church continues stedfastly in doctrine, fellowship, breaking of bread and prayers. Saul the persecutor meets the risen Christ and, as Paul, carries the gospel across the Roman world.
What it teaches
The risen Lord builds His church by His Spirit, and sends us to be His witnesses.
In the Scriptures
But 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. Acts 1:8 · KJV
Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls. And they continued stedfastly in the apostles’ doctrine and fellowship, and in breaking of bread, and in prayers. Acts 2:41-42 · KJV
And as he journeyed, he came near Damascus: and suddenly there shined round about him a light from heaven: And he fell to the earth, and heard a voice saying unto him, Saul, Saul, why persecutest thou me? And he said, Who art thou, Lord? And the Lord said, I am Jesus whom thou persecutest: it is hard for thee to kick against the pricks. And he trembling and astonished said, Lord, what wilt thou have me to do? And the Lord said unto him, Arise, and go into the city, and it shall be told thee what thou must do. Acts 9:3-6 · KJV
Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen. Matthew 28:19-20 · KJV