These individuals and groups of people, now infused with God's power, boldly went out among the nations and turned the world upside down with the message of God's great love and forgiveness available through His Son Jesus Christ.
After they prayed, the place where they were meeting was shaken. And they were all filled with the Holy Spirit and spoke the word of God boldly (Acts 4:31).
In speaking "the word of God boldly," they were not only proclaiming God's message of salvation, but speaking His word into life situations, and seeing His miracle-working power displayed, the result of being baptized with the Holy Spirit.
So Paul and Barnabas spent considerable time there, speaking boldly for the Lord, who confirmed the message of his grace by enabling them to do miraculous signs and wonders (Acts 14:3).