Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
Matthew 5:17
But though we, or an angel from heaven, should preach unto you any gospel other than that which we preached unto you, let him be anathema.
Galatians 1:8
But your heresy is anathema.
That’s exactly correct. Jesus fulfilled the law for us since there was no way we could have done it for ourselves. Not one “jot or one tittle shall pass from the law until it is fulfilled.
Matthew 5:18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
Then Christ came and fulfilled every “jot and tittle” of the law for us.
Matthew 5:17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
So Christ came and fulfilled the law and now we can put on His righteousness and are using His faith and not our own.
Philippians 3:9 And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith:
Galatians 2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
We have been granted through grace His wisdom, righteousness, sanctification, and redemption. It is not through our efforts lest we try to take credit but we give credit to Him who “fulfilled the law”.
1 Corinthians 1:30 But of him are ye in Christ Jesus, who of God is made unto us wisdom, and righteousness, and sanctification, and redemption: 31 That, according as it is written, He that glorieth, let him glory in the Lord.
Those who reject His grace and try to live under the law cannot fulfill the law and nullify the grace of God in their lives.
Rom. 11:6, "But if it is by grace, it is no longer on the basis of works, otherwise grace is no longer grace."
Gal. 2:21, I do not nullify the grace of God; for if righteousness comes through the Law, then Christ died needlessly.
We have been freed from the law of Moses.
Acts 13:39 and through Him everyone who believes is freed from all things, from which you could not be freed through the Law of Moses.
It is His strength and it is He who will keep us from stumbling.
Jude 1:24-25 Now to him who is able to keep you from stumbling and to present you blameless before the presence of his glory with great joy, to the only God, our Savior, through Jesus Christ our Lord, be glory, majesty, dominion, and authority, before all time and now and forever. Amen.