The same day there are added unto them about three thousand souls. Verse 13 says again, put away from among yourselves that wicked person. You cannot be put away from something of which you are not a part. So this indicates that the early church practiced church membership. To safeguard ourselves and to enable us to live lives that are glorifying to the Lord, we must be under spiritual accountability.
Children are accountable to the parents.
Wives are subject to husbands. Husbands and families should be submissive to the authority of the local church. That one is a believer in Jesus Christ, 2. That the individual has been baptized by immersion after receiving Jesus Christ as Lord and Savior, 3. That one is willing to place himself under the spiritual authority of that local church and its leadership, and 4.