“And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness.”
King James Version (KJV)
8:10 Now if Christ be in you - Where the Spirit of Christ is, there is Christ. The body indeed is dead - Devoted to death. Because of sin - Heretofore committed. But the Spirit is life - Already truly alive. Because of righteousness - Now attained. From #Rom 8:13|, St. Paul, having finished what he had begun, #Rom 6:1|, describes purely the state of believers.
Ro 8:10 If Christ [be] in you. Christ is in us by his Spirit. Notice that the indwelling of the Spirit of God, having the Spirit of Christ, belonging to Christ, having Christ in us, are all varied expressions of the same great fact. The body [is] dead because of sin. Our bodies have died physically because death came into the world through sin. But the Spirit [is] life. Our spirit is made alive by union with Christ, and partaking of his righteousness.