At this point in time there were twelve apostles in Jerusalem, twelve men who had seen Jesus and learned from him, twelve men specially commissioned to teach his Word to others. If you had any questions about doctrine, you simply asked them and they would make things clear. We do not have quite the same privilege today, but what we do have is the substance of their teaching. The books and letters of the New Testament are the apostolic teaching that God has given to nurture and build up his church in every generation. Our task is to study those Scriptures and do what they say. That is what it will mean for us to be devoted to the apostles' teaching and that is also the reason why Bible reading and preaching must always have a central place in our worship services. We do not gather on the Lord’s Day for entertainment, we come to hear from God and he speaks to us through his Word.