Colossians 2:10-15
10 And ye are complete in him, which is the head of all principality and power:
11 In whom also ye are circumcised with the circumcision made without hands, in putting off the body of the sins of the flesh by the circumcision of Christ:
12 Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead.
13 And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses;
14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;
15 And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.
Abridged Commentary - Colossians 2:12
2:12 In Romans 6:3-4, Galatians 3:27, and Colossians 2:12, the Apostle Paul speaks of being "baptized into Jesus Christ", and being "buried with (Jesus Christ) in baptism". In each case, it seems that this is either a reference to the baptism of the Spirit into the Body of Christ, mentioned in 1 Corinthians 12:12-13, which happens when a person believes in Jesus (Ephesians 1:12-14), or, it is the Apostle Paul expounding the symbolism of water baptism, which represents dying to oneself (Luke 9:23, Galatians 2:20), and walking in the newness of life secured by the death and resurrection of Jesus Christ.
The Grace New Testament Commentary - Colossians 2:12
2:12 By trusting in Jesus for eternal life, each believer is identified as having undergone the same burial and resurrection as that of Christ. This is the picture conveyed by water baptism, the reality that the believer has already trusted Christ and has been buried and then raised to life with Him. Therefore believers will live forever in Christ because Christ Himself lives forever. All this is not through man's effort or good works but only through the working of God. The baptism Paul refers to here is not water baptism, since no good work (even the ones commanded by God) adds, brings, or proves salvation. Rather, Paul is referring to the baptism of the Holy Spirit, the sealing of God's Spirit on each believer the moment he places his faith in Christ (Rom 6:3-4: 1 Cor 12:13; Gal 3:27; Eph 1:13).