For when he died unto sin, i.e. to take away sin, he died but once; see Hebrews 9:28, and Romans 10:10,14; but when he rose again from the dead, he lived with God for ever an immortal, endless life. By this phrase is expressed that eternal and indissoluble union which the Son hath with the Father.
Related Commentaries of Romans 6:10
Romans 6:10
10 For in that he died, he died unto sin once: but in that he liveth, he liveth unto God.