Gal 2:21 I do not frustrate the grace of God: for if righteousness is through the law, then Christ is dead in vain.
We are not under the Old Covenant law, but all may be covered by new law of Christ.
Mark 2:22 And no man putteth new wine into old bottles: else the new wine doth burst the bottles, and the wine is spilled, and the bottles will be marred: but new wine must be put into new bottles.
The New Testament Covenant has the saving blood of Christ. Those who were under the Old Covenant law only had a covering for sin, but the blood of Christ takes away sins.
Romans 11:27 For this is my covenant unto them, when I shall take away their sins.
Putting new wine into an old bottle will cause both to perish, because the old bottle is not designed for the new. Under the old Covenant law the temple of God was a building. Under the new Covenant law of Christ, we are the temple that he dwells in (1 Cor 3:16-17; 1 Cor 6:19).
Those that claim to be under the old Covenant law do not understand the new law of Christ.
Not only is the new law of Christ better, it also is the only one available, as the old has passed away. Any man in Christ is a new creation and all things have become new.
This new bottle then, refers to our vessel that the Holy Spirit can reside in. If we try and remain under the old Covenant law, the Holy Spirit is barred from entering in, and the end result is that of destruction. All in Christ are a new creation, through His Word of reconciliation (2 Cor 5:17-19; 2 Tim 2:21).
Jesus Christ has brought forth the new wine, which is the new covenant last. That which Christ supplies is available to all that ask (1 John 3:22).
Isaiah 65:8 Thus saith the LORD, As the new wine is found in the cluster, and one saith, Destroy it not; for a blessing is in it: so will I do for my servants’ sakes, that I may not destroy them all.
The old wine was available to those who were under the old Covenant law. The Old Testament Law was fulfilled by Christ on the Cross, and is finished (John 19:30).
Heb 8:13 In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.
No man also that drinks the old wine immediately is desirous of the new, for he reckons that the old is better (Luke 5:39).
Gal 3:2 This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith?
The second covenant was the Law of Christ written in the hearts of men, which represents Israel after the Spirit (Rom 11:26, Gal 6:15-16).
John 1:11-12 He came unto his own, and his own received him not. But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name.
Many who were under the old Covenant law refused the Messiah that the prophets spoke of (Mic 7:7, Zech 9:9, Isa 62:11).
Isaiah 9:6 For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.
Heb 8:6 But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
Under the old Covenant law we see the Ten Commandments written on tablets of stone.
The new covenant law of Christ is available to all who call upon His name. This law is the Spirit of Christ unto life, with two commandments, that are written on men’s hearts and in their minds (Heb 10:16; Math 22:37-39).
Christ also came to redeem those who were under the old Covenant law, that they too might receive the adoption and be called the sons of God (Gal 4:5, Eph 1:15).
Romans 8:14 For as many as are led by the Spirit of God, they are the sons of God.
Christ has redeemed us from the curse of the old law, that the blessing of Abraham might be available to us all through the Lord Jesus.
This blessing is the promise of the Spirit through faith (Gal 3:7-14).