Romans 6:3

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. But Paul takes up another principle — that we are then really united to the body of Christ, when his death brings forth in us its fruit; yea, he teaches us, that this fellowship as to death is what is to be mainly regarded in baptism; for not washing alone is set forth in it, but also the putting to death and the dying of the old man. It is hence evident, that when we become partakers of the grace of Christ, immediately the efficacy of his death appears. But the benefit of this fellowship as to the death of Christ is described in what follows. (184)