The church began on the Day of Pentecost. In obedience to Jesus, one hundred and twenty of His followers were gathered in the upper room awaiting the promise of the Holy Ghost. When the Day of Pentecost was fully come, Jesus poured out His Spirit and they all began to speak in other tongues as His Spirit gave them the utterance. (Acts 2:4)

Filled with the Holy Ghost and with the keys of the kingdom of heaven given to him by Jesus, Peter preached the first gospel message. (Matthew 16:19, Acts 2:22-24) At the conclusion, he declared what we must do to be saved – “Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.” (Acts 2:38)

From that point on, the church continued stedfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in prayers, and the Lord added to the church daily such as should be saved. (Acts 2:42, 47)

*This chart is from the Bible Study, "Exploring God's Word."