Now, there is a new house, the Body of Jesus Christ! Under the New Covenant that the Lord said would come forth, we see Jesus Christ as the High Priest. The old covenant with it’s laws and regulations have been taken away because thru Jesus Christ a new and better covenant has come in to place.
Hebrews 10:9
Then said he, Lo, I come to do thy will, O God. He taketh away the first, that he may establish the second.
And with the changing of the priesthood, God’s Word tells us there is also a change of the law.
Hebrews 7:12
For the priesthood being changed, there is made of necessity a change also of the law.
The Law of Moses has been replaced by the Law of Christ.
In the New Testament, many mentions of “the law” is actually referring to Law of Christ (aka the Law of Liberty) and is not talking about the old testament law. Christians are NOT called to keep or live under the old testament law, but we ARE called to live under the Law of Christ.
Ultimately this means we are called to abide In Christ which is living after the Spirit and not after the flesh, or to be spiritually minded and not carnally minded (see Romans 8). As we see in Romans 8, to be spiritually minded is life and peace but to be carnally minded is death which is separation from the Lord.
Galatians 6:2
Bear ye one another's burdens, and so fulfil the law of Christ.
1 Corinthians 9:21
To them that are without law, as without law, (being not without law to God, but under the law to Christ,) that I might gain them that are without law.
James 2:12
So speak ye, and so do, as they that shall be judged by the law of liberty.
James 1:25
But whoso looketh into the perfect law of liberty, and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed.
Romans 8:2
For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
*Free as in no longer being a slave to sin, as in stop doing sinful things!
In Matthew 4:15-23, Christ began his ministry with the Gospel message to repent for the Kingdom of God is at hand, which was a light to the Gentiles, and the Mosaic Law was how his audience knew what sin is (Romans 3:20), so repenting from our disobedience to it is a central part of the Gospel message. Furthermore, Jesus set a sinless example of how to walk in obedience to the Mosaic Law and we are told to follow his example (1 Peter 2:21-22) and that those who abide in Christ are obligated to walk in the same way he walked (1 John 2:6). So Christ spent his ministry teaching his followers to obey the Mosaic Law by word and by example and he did not establish the New Covenant for the purpose of undermining anything that he spent his ministry teaching, but rather the New Covenant involves God putting the Mosaic Law in our minds and writing it on our hearts (Jeremiah 31:33). I don't see a good reason to think that following the Law of Christ is something other than or contrary to following what Christ taught.
In 1 Corinthians 9:21, Paul used a parallel statement to equate not being outside the Law of God with being under the Law of Christ, and the Law of Moses is referring to as the Law of God in verses like Nehemiah 8:1-8, Ezra 7:6-12, and Luke 2:22-23.
The Mosaic Law is perfect (Psalms 19:7), it is of liberty (Psalms 119:45), and it blesses those who obey it (Psalms 119:1-3), so when James 1:25 speaks about the perfect law of liberty that blesses those who obey it, he wasn't saying anything about the Mosaic Law that wasn't already said in the Psalms.
In Romans 7:25-8:2, Paul contrasted the Law of God with the law of sin and contrasted the Law of the Spirit with the law of sin and death, so he equated the Law of God with the Law of the Spirit. After all, the Law of Moses was given by God and the Spirit is God, so it is the Law of the Spirit. God is not disagreement with Himself about which laws we should follow, so the Law of Christ is the same as the Law of the Spirit and the Law of the Father, which was given to Moses. Furthermore, in Romans 8:4-7, those who walk in the Spirit are contrasted with those who have minds set on the flesh who are enemies of God who refuse to submit to the Mosaic Law.
The Bible often uses the same terms to describe aspects of the nature of God as it does to describe aspects of the nature of the Mosaic Law, such as with it being holy, righteous, and good (Romans 7:12), and with justice, mercy, and faithfulness being weightier matters of the Mosaic Law (Matthew 23:23), which is because it is God's instructions for how to partake in the divine nature. In Hebrews 1:3, Jesus is the exact image of God's nature, which he expressed through living in perfect obedience to the Mosaic Law.
Law of Christ
The phrase "the law of Christ" appears only in Galatians 6:2, although it is implied by the wording of 1 Corinthians 9:21 as well. In both places, its precise meaning is difficult to fix. In Galatians, Paul argues vigorously that the law given at Sinai makes no claim on those who believe in Christ, whether Gentile or Jew ( 2:15-21 ; Galatians 3:10-14 Galatians 3:23-26 ; 4:4-5 ; 4:21-5:6).
Galatians should not be interpreted as speaking against obeying what Christ taught.
Jesus' teaching, although standing in continuity with the law given at Sinai, nevertheless sovereignly fashions a new law. In some instances Jesus sharpens commandments ( Matt 5:17-48 ) and in others considers them obsolete ( Mark 7:17-19 ). On one occasion, having been asked to identify the greatest commandment, Jesus concurs with the Jewish wisdom of his time ( Mark 12:32-33 ) that the greatest commandments are to love God supremely and to love one's neighbor as oneself ( Mark 12:28-31 ). He breaks with tradition, however, by defining the term "neighbor" to mean even the despised Samaritan ( Luke 10:29-37 ).
In Deuteronomy 4:2, it is a sin to add to or subtract from the Mosaic Law, so Jesus did not do that. In Matthew 4, Jesus consistently proceeded a quote from what was written by saying "it is written...", but in Matthew 5, he consistently proceeded a quote from what the people had heard being said by saying "you have heard that it was said...", so his emphasis on the form of communication is important. Jesus was not sinning by making changes to the Mosaic Law, but rather he was fulfilling it by correcting what the people had heard being taught and by teaching how to correctly obey it as it was originally intended.
In Mark 7:1-13, Jesus criticized the Pharisees as being hypocrites for setting aside the commands of God in order to establish their own traditions, so he should not be interpreted as turning around and even more hypocritically doing what he just finished criticizing the Pharisees for doing, especially because that would mean that he sinned and therefore disqualified himself as being our Savior.
In Matthew 22:36-40, Jesus summarizes the Mosaic Law as being about how to love God and our neighbor and that that all of the other commandments hang on them, so if you think that we should obey the greatest two commandments, then you should also think that we should obey all of the other commandments that hang on them. For example, if we love God and our neighbor, then we won't commit adultery, idolatry, theft, murder, kidnapping, rape, favoritism, and so forth for the rest of the Mosaic Law.
Galatians 5:4 Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
All throughout the Bible, God wanted His people to repent and to return to obedience to the Mosaic Law, and even Christ because his ministry with that Gospel message, so it would be absurd to interpret Galatians 5:4 as Paul warning us against following Christ and saying that we will be cut off from Christ if we follow him. In Psalms 119:29-30, he wanted to put false ways far from him, for God to be gracious to him by teaching him to obey the Mosaic Law, and he chose the way of faith by setting it before him, so this is what it means to be under grace, and this has always been the one and only way of salvation by grace through faith. It would again be absurd to interpret that as saying that he wanted God to be gracious to him by teaching him how to fall from grace.