The Holy Spirit is Still Working
The Holy Spirit was released on the day of Pentecost just as the Father Promised and Jesus said. Although the Spirit fell upon the 120 obedient disciples who gathered in the upper room, the work of the Spirit was just beginning. On the day of Pentecost the Spirit fully came to work in the people of God and represent the godhead on earth. In Acts 4:31 we see another outpouring of the Spirit upon the early church: And when they had prayed, the place where they were assembled together was shaken; and they were all filled with the Holy Spirit, and they spoke the word of God with boldness. The Spirit continues to work daily to convict and reprove of sin, as He leads and guides into all truth.
Key Scripture (Acts 1:8): But you shall receive power when the Holy Spirit has come upon you; and you shall be witnesses to Me in Jerusalem, and in all Judea and Samaria, and to the end of the earth.
Although Peter was the Chief Apostle and filled with the Holy Spirit. He had a bias that the Spirit dealt with over time, just as He does with each of us in our walk with GOD. During his first sermon Peter focused his message on the men of Jerusalem and Judea, even though there were in attendance persons from all over the world. Moreover, Jesus said the disciples would be His witnesses in Jerusalem, Judea, Samaria and the end of the earth.
Ironically, the Lord had Peter preach in Samaria where 5000 souls were saved - more than on the day of Pentecost when 3000 souls were saved. Amazingly the Holy Spirit did not fall on any of them until Peter showed up (see Acts 8:14-17).
In another instance the Lord sent Peter to the house of Cornelius where Peter was yet speaking when the Holy Spirit fell upon all that were in the house of Cornelius. The Spirit of God has a way of affirming who is approved of God so that we, like Peter can overcome personal bias and prejudice, so that we can serve the Lord in righteousness.