Scripture shows us that there were two laws of God and that one of these laws is valid for Christians to obey.
These two laws were the written Law of Moses which was carved on stone and the Law of Liberty of God which is spiritually written on people's hearts.
The written Law of Moses carved on stone was not the same law as the Law of Liberty of God which is spiritually written on people's hearts.
The spiritual Law of Liberty is so-called because it does not contain the oppressive written Law of Moses which was carved on stone.
The spirit of the OC Law of Moses is the same law as the NC Law of Liberty of God.
Scripture shows us exactly what is the spirit of the Law of Moses. It is the spirit of the Law of Moses (the Law of Liberty) which will always be required of all people, both Jew and non-Jew.
The spirit of the Law of Moses is that I must love the Lord my God with all my heart, and with all my soul, and with all my strength, and with all my mind; and my neighbor as myself. If I do these things that are commanded in the spirit of the Law of Moses (aka the Law of Liberty) until I die, I will then be approved to inherit eternal life.
Luke 10:25-28
And behold, a lawyer stood up to put him to the test, saying, “Teacher, what shall I do to inherit eternal life?” 26 He said to him, “What is written in the law? How do you read?” 27 And he answered, “You shall love the Lord your God with all your heart, and with all your soul, and with all your strength, and with all your mind; and your neighbor as yourself.” 28 And he said to him, “You have answered right; do this, and you will live.” rsv
James 2:8-13
If you really fulfil the royal law, according to the scripture, “You shall love your neighbor as yourself,” you do well. 9 But if you show partiality, you commit sin, and are convicted by the law as transgressors. 10 For whoever keeps the whole law but fails in one point has become guilty of all of it. 11 For he who said, “Do not commit adultery,” said also, “Do not kill.” If you do not commit adultery but do kill, you have become a transgressor of the law. 12 So speak and so act as those who are to be judged under the law of liberty. 13 For judgment is without mercy to one who has shown no mercy; yet mercy triumphs over judgment. rsv
Christians are under the Law of Liberty of God. Christians are not under the written Law of Moses. God has spiritually written His Law of Liberty on all Christians' hearts. God does not give Christians the written Law of Moses which was carved on stone.
2 Corinthians 3
Christians are under the spirit of the Law of Moses, but they are not under the written Law of Moses carved on stone with all its sabbaths, new moons, and festivals requirements. Colossians 2:9-17
Even some of the Gentiles obeyed the
spirit of the Law of Moses.
Romans 2:14-16
When Gentiles who have not the (written) law (of Moses) do by nature what the (spirit of) the law (of Moses) requires, they are a law to themselves, even though they do not have the law (of Moses). 15 They show that what the (spirit of the) law (of Moses) requires is written on their hearts, while their conscience also bears witness and their conflicting thoughts accuse or perhaps excuse them 16 on that day when, according to my gospel, God judges the secrets of men by Christ Jesus. rsv
The following is a prophecy for the Israelites about the spiritual Law of Liberty of God which will replace the unbearable yoke of the written Law of Moses carved on stone.
Jeremiah 31:33
But this is the covenant which I will make with the house of Israel after those days, says the Lord: I will put my law within them, and I will write it upon their hearts; and I will be their God, and they shall be my people. rsv
Jesus Christ fulfilled this prophecy of Jeremiah. The following was written after Jesus' resurrection and ascension, but before 70 A.D. when Jerusalem, its temple, and the Jews living there were destroyed.
Hebrews 8:4-10
Now if he were on earth, he would not be a priest at all, since there are priests who offer gifts according to the law. 5 They serve a copy and shadow of the heavenly sanctuary; for when Moses was about to erect the tent, he was instructed by God, saying, “See that you make everything according to the pattern which was shown you on the mountain.” 6 But as it is, Christ has obtained a ministry which is as much more excellent than the old as the covenant he mediates is better, since it is enacted on better promises. 7 For if that first covenant had been faultless, there would have been no occasion for a second.
8 For he finds fault with them when he says:
OLD COVENANT PROPHECY
“The days will come, says the Lord,
when I will establish a new covenant with the house of Israel
and with the house of Judah;
9 not like the covenant that I made with their fathers
on the day when I took them by the hand
to lead them out of the land of Egypt;
for they did not continue in my covenant,
and so I paid no heed to them, says the Lord.
10 This is the covenant that I will make with the house of Israel
after those days, says the Lord:
I will put my laws into their minds,
and write them on their hearts,
and I will be their God,
and they shall be my people." rsv
Jesus Christ/God made a new covenant with the Israelites. The written Law of Moses carved on stone is not part of His New Covenant. The spirit of the Law of Moses is embodied in Jesus' New Covenant as the Law of Liberty of God. We are all under the NC now and so we must obey the Law of Liberty of God which is spiritually written on our hearts. Romans 10:12, Acts 15:8-10
James 2:8
If you really fulfil the royal law, according to the scripture, “You shall love your neighbor as yourself,” you do well. rsv
The Israelites needed specific instructions and training on how to be obedient to God because they were a stiff-necked and rebellious people. The written Law of Moses was given to them because of their disobedience in the desert. They were given this
written letter of the Law of Moses carved on stone because of their disobedience.
Exodus 32:9, Acts 7:51
However, the spirit of the Law of Moses is shown in the following passage.
Matthew 19:16-19
And behold, one came up to him, saying, “Teacher, what good deed must I do, to have eternal life?” 17 And he said to him, “Why do you ask me about what is good? One there is who is good. If you would enter life, keep the commandments.” 18 He said to him, “Which?” And Jesus said, “You shall not kill, You shall not commit adultery, You shall not steal, You shall not bear false witness, 19 Honor your father and mother, and, You shall love your neighbor as yourself.” rsv
Please note that Jesus does not require the Sabbath observance in His NC Law of Liberty. The Sabbath observance was required in the OC Law of Moses to train them in godliness, but the Sabbath observance is not required by Christians under Jesus' NC Law of Liberty.
Jews did become Christians, but Christians did not become Jews and so Christians were not required to keep the Sabbaths of the Jews. Christians are not bound and cannot be bound to the written Law of Moses carved on stone. The written Law of Moses does not apply to Christians. The spirit of the Law of Moses (Law of Liberty) written on each person's heart does apply to Christians.
A person may observe a personal sabbath/rest on any day of the week if he so chooses, but he is still obligated to assemble with Christians on the first day of the week for public worship to commemorate their spiritual rebirth.
Hebrews 10:23-26
Let us hold fast the confession of our hope without wavering, for he who promised is faithful; 24 and let us consider how to stir up one another to love and good works, 25 not neglecting to meet together, as is the habit of some, but encouraging one another, and all the more as you see the Day drawing near. 26 For if we sin deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, 27 but a fearful prospect of judgment, and a fury of fire which will consume the adversaries. rsv
Romans 14:1-6
As for the man who is weak in faith, welcome him, but not for disputes over opinions. 2 One believes he may eat anything, while the weak man eats only vegetables. 3 Let not him who eats despise him who abstains, and let not him who abstains pass judgment on him who eats; for God has welcomed him. 4 Who are you to pass judgment on the servant of another? It is before his own master that he stands or falls. And he will be upheld, for the Master is able to make him stand.
5 One man esteems one day as better than another, while another man esteems all days alike. Let every one be fully convinced in his own mind. 6 He who observes the day, observes it in honor of the Lord. He also who eats, eats in honor of the Lord, since he gives thanks to God; while he who abstains, abstains in honor of the Lord and gives thanks to God. rsv
Christians are to be living stones/examples to others, by showing them by their holy example that they obey the Law of Liberty of God which was spiritually written upon their hearts. Their good example will cause people to desire to come to the knowledge of the truth of the gospel of Jesus Christ and be saved. 1 Peter 2:4-5
2 Corinthians 3:2-4
You yourselves are our letter of recommendation, written on your hearts, to be known and read by all men; 3 and you show that you are a letter from Christ delivered by us, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts. 4 Such is the confidence that we have through Christ toward God. rsv