By the old man is meant, that corrupt and polluted nature which we derive from Adam, the first man: see Ephesians 4:22 Colossians 3:9,10. The old and new man are opposites; as then the new man is the image of God repaired in us; so the old man is a depravation of that image of God, and a universal pollution of the whole man. Is crucified with him; by virtue of our union with him, and by means of his death and crucifixion: see Galatians 2:20. The body of sin is the very same that he called before the old man. The corrupt nature is sometimes called the body, Romans 8:13, sometimes a body of death, Romans 7:24, and here the body of sin. It is indeed a mere mass and lump of sin; it is not one sin, but all sin seminally. It is with respect to this body of sin, that particular lusts and corruptions are called members, Colossians 3:5. Might be destroyed; weakened more and more, till at last it be destroyed. That henceforth we should not serve sin; as we did before regeneration, and as they still do who voluntarily commit it, 1 Thessalonians 8:34. They do not only act sin, but are acted by it, having as many lords as lusts, Titus 3:3. See more of this, Romans 6:16.
Related Commentaries of Romans 6:6
Romans 6:6
6 Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin.