Communities of new believers formed by the Gospel
Acts 2:42–47 (ASV)
42And they continued stedfastly in the apostles’ teaching and fellowship, in the breaking of bread and the prayers.
43And fear came upon every soul: and many wonders and signs were done through the apostles. 44And all that believed were together, and had all things common; 45and they sold their possessions and goods, and parted them to all, according as any man had need. 46And day by day, continuing stedfastly with one accord in the temple, and breaking bread at home, they took their food with gladness and singleness of heart, 47praising God, and having favor with all the people. And the Lord added to them day by day those that were saved.
A man who had been "thoroughly immersed in sporting, and other worldly amusements" received the Lord and became a preacher. This was the result of the tireless confidence of his sister who was the only Christian in the whole community for a period; eventually, numerous people in the community converted and a church was erected.
To Believe But Also to Suffer, The Story of Today's Heroes Behind the Iron Curtain by Marguerite Warburton
Maria first heard the gospel of Jesus passively over the radio, but as she continued to tune in to the channel she first heard the gospel proclaimed, she eventually became a Christian. And soon she was telling her neighbors about her experience and before long, an entire neighborhood came to believe in the Lord through the radio, and that community of believers continues to thrive today.