Treasury of Scripture Knowledge
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:
This is because no human being can be considered right with God by [obeying] the requirements of a law. [Note: It is difficult to determine the exact sense in which "law" is used in these verses. It may be law generally, or the law of Moses specifically. See Bruce, pages 52-58]. For the knowledge of what sin is comes from the law of Moses.
For when we were in the flesh [i.e., before conversion], our sinful desires, aroused by [the restrictions of] the law of Moses, worked in our bodies to produce activity that led to [spiritual] death.
and [it is] by Him that every believer is made right with God in every way that he could not have been made right by [observing the requirements of] the law of Moses.
Is the law of Moses contrary to the promises of God? Certainly not! For if there had been a law given which could provide [never ending] life, then a person could be considered right with God by [obeying the requirements of such] a law.
For on one hand, the previous command [i.e., the law of Moses] was set aside because it was weak and useless,
For the law of Moses was [only] a foreshadow of the good things that [were] to come [i.e., in the Messianic age], not the exact image of those things. It can never, by the same sacrifices, continually offered year after year, make [morally] perfect those who draw near [to God in worship].
2 Corinthians 5:21
God considered Christ to be sinful on our behalf, even though He never sinned, so that we could be considered right with God through Him.
Christ bought us back from the curse [caused by our not obeying all the requirements] of the law of Moses; He became a curse for us [by dying on the cross], for it is written [Deut. 21:23], "Every one who hangs on a tree [i.e., a cross] is cursed [i.e., cut off from God]."
We know that our old self was [figuratively] crucified with Christ, in order that the body of sin [i.e., our whole life of sin] might be destroyed [i.e., become powerless to control our actions and thoughts], so that we should not be enslaved to the practice of sin any longer.
1 Peter 2:24
Jesus took upon Himself our sins [when] His body was placed upon the cross so that we, [through] dying to [i.e., giving up] the sinful life, would live for righteousness. You were healed [from your sins] by His being brutally treated.
1 Peter 4:1
Therefore, since Christ has suffered physically, you people should fortify yourselves with the same attitude He had. For the person who has suffered physically [i.e., in standing for Christ] has quit sinning.
For we conclude that a person is made right with God by faith [in Christ], apart from [obedience to] the requirements of a law [or, the law of Moses, See verse 20].