Under the law or the Old Covenant, justification required perfect obedience.
compare the following Scripture verses: Lev.18:5Ye shall therefore keep my statutes, and my judgments: which if a man do, he shall live in them: I am the LORD. with Rom.10:5For Moses describeth the righteousness which is of the law, That the man which doeth those things shall live by them. Rom.2:13(For not the hearers of the law are just before God, but the doers of the law shall be justified. and James 2:10For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.
What does the Bible say about justification under the Gospel?
Justification is not of works! — Acts 13:39And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses. Rom.8:3For 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: Gal. 2:16Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified. Gal.3:11But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith. [ to be continued ]