Matthew 28:19-20 ESV
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 observe all that I have commanded you. And behold, I am with you always, to the end of the age.”
Water baptism symbolizes the believer’s total trust in and total reliance on the Lord Jesus Christ, as well as a commitment to live obediently to Him. It also expresses unity with all the saints (Ephesians 2:19), that is, with every person in every nation on earth who is a member of the Body of Christ (Galatians 3:27–28). Water baptism conveys this and more, but it is not what saves us. Instead, we are saved by grace through faith, apart from works (Ephesians 2:8–9)
Water baptism is a beautiful picture of what our Lord has done for us. As we are completely immersed in the water, we symbolize burial with our Lord; we are baptized into His death on the cross and are no longer slaves to self or sin (Romans 6:3–7). When we are raised out of the water, we are symbolically resurrected—raised to new life in Christ to be with Him forever, born into the family of our loving God (Romans 8:16). Water baptism also illustrates the spiritual cleansing we experience when we are saved; just as water cleanses the flesh, so the Holy Spirit cleanses our hearts when we trust Christ.