Q 104. What is the duty of those who are rightly baptized?
A. It is the duty of those who are rightly baptized to give up (join) themselves to some visible and orderly church of Jesus Christ, that they may walk in all the commandments and ordinances of the Lord blameless.
And day by day, attending the temple together and breaking bread in their homes, they received their food with glad and generous hearts, praising God and having favor with all the people. And the Lord added to their number day by day those who were being saved. Acts 2:46-47
And when he had come to Jerusalem, he attempted to join the disciples. And they were all afraid of him, for they did not believe that he was a disciple. Acts 9:26
you yourselves like living stones are being built up as a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ. 1 Peter 2:5
not neglecting to meet together, as is the habit of some, but encouraging one another, and all the more as you see the Day drawing near. Hebrews 10:25
Greet also the church in their house. Greet my beloved Epaenetus, who was the first convert to Christ in Asia. Romans 16:5