John Chrysostom

But it is not burial only: for behold what he says, "Wherein ye were also raised with Him, through faith in the working of God, who raised Him from the dead." He hath well said, "of faith," for it is all of faith. Ye believed that God is able to raise, and so ye were raised. Then note also His worthiness of belief, "Who raised Him," he saith, "from the dead." He now shows the Resurrection. …

Homily on Colossians 6 ↗

Theophylact of Ohrid

What he called circumcision, he now calls a grave, presenting in comparison something greater than circumcision. For what was circumcised was not simply cast off, but perished and decayed. Thus, the one who is baptized is buried together with Christ, by the threefold immersion depicting the three-day burial of the Lord, and dying as the old and sinful man. Not only does baptism serve as a burial, but also as a resurrection. In what way? Through faith. …

Commentary on Colossians ↗

Thomas Aquinas

Secondly, he shows that we have received this circumcision in baptism, and so baptism is a spiritual circumcision. And first, he shows that in baptism we have a symbol of Christ's death, secondly, that in baptism we receive a likeness to his resurrection (v. 12b). …

Commentary on Colossians ↗