There are several biblical reasons to support believer's baptism. The Lord Jesus gave His disciples this clear command that needs to be considered, "Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit..." (Matthew 28:19). Not only did Jesus command His followers to baptize believers, but He modeled it Himself and set an example for us to follow. In Mark 1:9-11 it says, "Jesus was baptized by John in the Jordan."
Because a Christian is a follower of Christ, he should also follow Christ in baptism. The early New Testament church serves as a model for us. At Pentecost, the 3,000 people who believed and were converted followed the Lord in baptism (Acts 2:41). This continued to be the pattern followed by the early believers, "Many of the Corinthians who heard him believed and were baptized" (Acts 18:8).
Secondly, baptism is of great significance to a. believer, because it personifies a dying to self and being raised to newness of life in Christ Jesus. "Having been buried with Him in baptism and raised with Him through your faith in the power of God who raised Him from the dead. When you were dead in your sins...God made you alive with Christ... " (Colossians 2:12,13). Finally, baptism reveals one's loyalty and obedience to Christ and His Word.