Therefore by the deeds of the law there shall No flesh be justified in his sight: for by the law (is) knowledge of sin (Romans 3:20)
Agreed....! The “old law” Paul was talking about here could justify no one, that’s why that covenant was made obselete and replaced with a “new law” or covenant.
Jer. 31:30-32
31“Behold, the days are coming, says the Lord, when I will make a new covenant with the house of Israel and with the house of Judah— 32 not according to the covenant that I made with their fathers in the day that I took them by the hand to lead them out of the land of Egypt, My covenant which they broke, though I was a husband to them,[a] says the Lord.
Matt. 26:27-29
27 Then He took the cup, and gave thanks, and gave it to them, saying, “Drink from it, all of you. 28 For this is My blood of the new[a] covenant, which is shed for many for the remission of sins. 29 But I say to you, I will not drink of this fruit of the vine from now on until that day when I drink it new with you in My Father’s kingdom.”
2 Cor. 3:6-7
6 who also made us sufficient as ministers of the new covenant, not of the letter but of the Spirit;[a] for the letter kills, but the Spirit gives life.
Heb.8:12-13
12 For I will be merciful to their unrighteousness, and their sins and their lawless deeds[a] I will remember no more.”[b]13 In that He says, “A new covenant,” He has made the first obsolete. Now what is becoming obsolete and growing old is ready to vanish away.
Hebrews 12:23-25
23 to the general assembly and church of the firstborn who are registered in heaven, to God the Judge of all, to the spirits of just men made perfect, 24 to Jesus the Mediator of the new covenant, and to the blood of sprinkling that speaks better things than that of Abel.Hear the Heavenly Voice
25 See that you do not refuse Him who speaks. For if they did not escape who refused Him who spoke on earth, much more shall we not escape if we turn away from Him who speaks from heaven,