Do you not know that all of us who have been baptized into Christ Jesus were baptized into his death?
3. Know ye not, etc. What he intimated in the last verse — that Christ destroys sin in his people, he proves here by mentioning the effect of baptism, by which we are initiated into his faith; for it is beyond any question, that we put on Christ in baptism, and that we are baptized for this end — that we may be one with him.
To use the doctrine of grace as license for sin is to abuse it utterly and reject it with abhorrence. Any opinion that opens a door to practical immorality, however plausible its appeal to free grace, contradicts the truth as it is in Jesus. Sanctification consists in two things: mortification, dying to sin, and vivification, living to righteousness.
AI summary
Commenting on Romans 6:1-23
Know ye not that so many of us as, You must know this, you cannot be ignorant of it, that whoever were baptized into Jesus Christ, were baptized into his death: and therefore must be dead to sin, and consequently ought not to live, nor can they live in sin.