“For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:”
King James Version (KJV)
8:3 For what the law - Of Moses. Could not do, in that it was weak through the flesh - Incapable of conquering our evil nature. If it could, God needed not to have sent his own Son in the likeness of sinful flesh - We with our sinful flesh were devoted to death. But God sending his own Son, in the likeness of that flesh, though pure from sin, condemned that sin which was in our flesh; gave sentence, that sin should be destroyed, and the believer wholly delivered from it.
Ro 8:3 What the law could not do. Because of the resistance it met in human nature. It was not strong enough to overcome the tendency of the flesh, the carnal nature, to evil. God did this by sending his own Son in the likeness of sinful flesh. When Christ came in human form he took the likeness of sinful flesh. And for sin. As a sacrifice for our sins. See Joh 1:29. Condemned sin in the flesh. To "condemn" is to sentence and to devote to destruction. Sin is condemned, (1) By the spotless life of Christ. In the flesh he was without sin. (2) By his death for sin our past sins are forgiven. (3) By our vital union with his death and life we rise to walk in a new life, with a new spirit, and hence, not under the power of the flesh. See Ro 6:4.