The early disciples followed after the Apostles doctrine or teaching steadfastly (Acts 2:42). Now this begs the question as to why? Why follow their doctrine, why not just do whatsoever I wish because their is nothing that I can do now as to forfeit my salvation? Now that I have the grace that is in Christ Jesus (2 Tim. 2:1) why not just eat, drink, and be merry? After all God is love. Let us notice very carefully the word “steadfastly”. That means to persevere, to remain constant, to carry on without wavering. One must now consider the vital importance of the doctrine taught by the Apostles.
We follow the Apostles doctrine or instruction because they are the standard for authority. When one reads the Gospel of John we realize that the Holy Spirit would guide the Apostles and that, the Holy Spirit would be speaking what He heard from Jesus (John 16:13). So we as new testament Christians have no “AUTHORITY” to do whatever we want in matters of religion. There must first be authorization before we do a thing in worship to God.
The Apostle Paul inspired of God would write to the Colossians “whatsoever you do in word or deed do all in the name of the Lord” (Col. 3:17). That is to do all by the authority and command of Christ, to do all for the honour and glory of Jesus the Christ, to do all after the pattern and example of Christ. Let your words be right and your actions upright in the sight of God.
The writers of the new testament would often times write to correct some error that those now Christians were doing or to encourage them and remind them who and what they are in Christ Jesus. What hope, joy, and love they have in Christ Jesus and to remain faithful even under the worst of circumstances (Rev.2:10). In Acts 5:28 they charged them (Peter and the rest of the Apostles) not to teach in the name (Jesus) but they did not obey and filled all Jerusalem with the doctrine (teaching of Christ). As a result they were beaten and released, upon their release they were rejoicing that they were counted worthy to suffer dishonor for the Name! Everyday in the temple and at home, they ceased not to teach and preach Jesus as the Christ (Acts 5:40-42).
Friends it is the doctrine of Christ that binds us. We can not say we are unified in Christ and all teach a different doctrine. Can two walk together except they be in agreement (Amos 3:3)? What ties us together is Christ but not all have obeyed HIM. I cannot set up the terms of entrance into His kingdom. He said he that believes and is baptized shall be saved and he that believeth not shall be condemned (Mark 16:16). Once in the body of Christ (Eph.1:22-23) I must walk in the light as He is in the light, (and) we have fellowship one with another, and His blood cleanses us from all sins (1 John 1:7).