Evidence collected about the early church suggests that most of the preaching in hamlets, villages, and rural areas was done by uneducated but devout lay people. The apostolic preaching, as well as the writings of the apostolic fathers of the second century that have been preserved, stand as exceptions to this overall trend.
The kerygma (preaching) is a summary of the preaching themes of the early church, based on the study of the sermons in the book of Acts. These themes, most visible in Peter’s sermon on the day of Pentecost (Acts 2:14–41), lie at the heart of the gospel.
The New Testament records a number of occasions on which Jesus, the apostles, or the early Christians are found taking part in Jewish festivals or other acts of worship. The accounts of these events involve terminology descriptive of Jewish worship.