Acts 2 records the birthday of the church, when the Holy Spirit descended upon the 120 believers who were assembled in the Upper Room. It also records the growth process of the infant church. On the Day of Pentecost, about 3000 people believed the gospel, repented of their sins, and were baptized as followers of Jesus Christ. Acts 2:42 says: “And they devoted themselves to the apostles’ teaching and fellowship, to the breaking of bread and the prayers.” And the last sentence of Acts 2:47 reports, “And the Lord added to their number day by day those who were being...