Colossians 2:14-16 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross; [And] having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it. Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath [days]: The OT law was given to  show us our sin....our need for a savior. The law was condemning and it empowered sin in our lives.No man is justified by the law. The just shall live BY FAITH.  Romans 7:6 But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not [in] the oldness of the letter. What shall we say then? [Is] the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet. For I was alive without the law once: but when the commandment came, sin revived, and I died.   Romans 8:1-3 [There is] therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit. For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death. 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: That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.   Galatians 3:10 For as many as are of the works of the law are under the curse: for it is written, Cursed [is] every one that continueth not in all things which are written in the book of the law to do them.  Galatians 3:11 But that no man is justified by the law in the sight of God, [it is] evident: for, The just shall live by faith.  Galatians 3:12 And the law is not of faith: but, The man that doeth them shall live in them.  Galatians 3:13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed [is] every one that hangeth on a tree  Galatians 3:14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith. 
Galatians 3:24 Wherefore the law was our schoolmaster [to bring us] unto Christ, that we might be justified by faith.