Hebrews 6:1 Therefore let us leave the elementary teachings about Christ and go on to maturity, not laying again the foundation of repentance from acts that lead to death, and of faith in God, 2 instruction about baptisms, the laying on of hands, the resurrection of the dead, and eternal judgment.
Believer's Baptism is what we are commanded to do in Matthew 28:19-20 "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, teaching them to obey all that I have commanded you. And behold, I am with you always, to the end of the age." In the book of Acts, people were baptized directly after believing if water was available (Acts 2:40-41; 8:35-39; 16:31-34).
Peter calls baptism "the pledge of a good conscience toward God"(1 Peter 3:21). William Barclay wrote in his commentary, The Letters of James and Peter, the meaning of the Greek word translated "pledge" in the NIV. "In every business contract there was a definite question and answer which made the contract binding. The question was, 'do you accept the terms of this contract and bind yourself to observe them?'...In baptism, God said to the person coming out of heathenism (unbelief): 'Do you accept My terms of service? Do you accept the privileges and promises, and do you undertake its responsibilities and demands?' In the act of being baptized the man answered, 'Yes'.
When a person is baptized by being immersed in water, the new believer is agreeing to serve God fully using all of God's resources to accomplish God's purposes even to the point of giving up his/her life. The water baptism reveals publically the commitment the person made to Jesus when he/she believed the gospel, receiving Jesus as his/her Lord and Savior. Baptism doesn't save anyone, but it does reveal a person's commitment to serve the Lord Jesus Christ unto death. Have you answered "Yes" to God's questions, "Do you accept My terms of service (Matthew 16:24-25; Luke 14:26,33)?" and "Do you accept the privileges and promises (John 10:10b; 2 Peter 1:3-4; 2 Corinthians 1:20; Galatians 5:22-23)?" and "Do you undertake its responsibilities and duties (Matthew 28:19-20; John 13:34-35)?" by being baptized in water?