A post from another guy...
Post 322 from Joseph1949
Water baptism is not a commandment. Actually Jesus explains it simply in Acts1:5...
John baptized with water, BUT YOU will be baptized in holy spirit. The (but) implies John did it this way, BUT you will be baptized this way. To be born again is to confess Jesus as Lord and believe God raised him from the dead (Romans 10:9,10) Baptism is equated to receiving holy spirit within, it is trusting with the heart. The proof over and over again in the book of Acts is shown. When they were baptized, they manifested holy spirit by speaking in tongues. You don't see much of that in the church today.
That is a twist on what John actually said. He said "I indeed baptize you with water unto repentance. but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptize you with the Holy Ghost, and with fire: "
He did not say But You will be baptized in holy spirit instead of water nor did he intend to mean anything like that. He baptized in water, Jesus baptizes with the Holy Ghost.
You however will be baptized in both.
The ordinance of water baptism has been a part of Christian practice from the beginning of the Church. This practice was such a common part of the Early Church’s life that F. F Bruce comments,
“The idea of an unbaptized Christian is simply not entertained in the New Testament.” (F. F. Bruce, The Book of Acts, The New International Commentary on the New Testament (Grand Rapids: Wm. B. Eerdmans, 1954), 77.)
Christ set the pattern for Christian baptism when He himself was baptized by John at the beginning of His public ministry (Matt. 3:13–17). Then He later commanded His followers to go into all the world and make disciples, “baptizing them in [Gk. eis, “into”] the name of the Father and of the Son and of the Holy Spirit” (Matt. 28:19). Therefore, Christ instituted the ordinance of baptism by both His example and command.
A major purpose of believers’ being baptized in water is that it signifies their identification with Christ. New Testament believers were baptized “into” (Gk. eis) the name of the Lord Jesus (Acts 8:16), indicating that they were entering the realm of Christ’s sovereign lordship and authority. In baptism, the new believer “testifies that he was in Christ when Christ was judged for sin, that he was buried with him, and that he has arisen to new life in him.” Baptism indicates that the believer has died to the old way of life and entered “newness of life” through redemption in Christ. The act of water baptism does not effect this identification with Christ, “but presupposes and symbolizes it.” Baptism thus symbolizes the time when the one who previously had been the enemy of Christ makes “his final surrender.”
Water Baptism also signifies that believers have identified with the body of Christ, the Church. Baptized believers are initiated into the community of faith, and in so doing they give public testimony to the world of their allegiance with the people of God. This seems to be a major reason New Testament believers were baptized almost immediately upon conversion. In a world that was hostile to the Christian faith, it was important that new believers take their stand with the disciples of Christ and become immediately involved in the total life of the Christian community.
Horton, Stanley M.. Systematic Theology: Revised Edition . BookMasters. Kindle Edition.