You are getting the 2 covenants confused. We are not under the Law of Moses, which was given to ancient Israel. That Covenant was dispensed with at the Cross, where Israel's failure to obtain Eternal Life was countermanded by Christ's resurrection from the dead. Christ then became the exclusive New Covenant, by which man can obtain Eternal Life, rendering continued service to the Law of no value.
The preaching that God's Law has no value for men is the oldest deception ever recorded in Scriptures. Eve was convinced by a voice who also "professed to know God", that God's Law is of no value to her. Therefore, she became the god, and created her own law. And "many" who come in Christ's Name, have adopted this same religious philosophy which refuses to acknowledge some undeniable biblical facts.
#1. It's God's LAW, not Moses'. The deceiver cleverly omits this Godly truth in its deception. Moses never created even One Law. But it would be much harder for the deceiver to convince folks into believing that "Yielding themselves" Servants to obey God, has no value for men, so they use the term "Law of Moses", implying that an obedient servant, like His Son Jesus and other examples of faith given us by the God inspired scriptures, "yielded themselves" servants to obey Moses.
#2. Our reasonable service is to the One True God not a law. The New Covenant, as defined by God, doesn't represent the new covenant promoted by the deceiver. In God's New Covenant, HIS writes HIS Law on the hearts of those men who "Yield themselves servants" to obey Him, like Abraham did. Why? Because He created His Law "for men", for the wellbeing of men. That it might be well with men. For men's Admonition, for men's Sakes no doubt. At least this is what the scriptures teach. So in God's New covenant, God's Law has great value for men, so much so that God writes His Laws on their hearts. The deceiver doesn't want men to know the value of God's LAW to the inward man. So it preaches, through its many "ministers of righteousness" and those men who Paul said "Transforms themselves into Apostles of Christ", that God's Law is of no value.
The Jesus "of the Bible" speaks to this very thing in Matt. 7.
22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? 23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
These men too, were deceived by men "who come in Christ's Name" to believe that God's Law had no value to them in the New covenant.
My hope is that you will follow the advice of the Christ "of the Bible" and consider "Every Word" which proceeds from the mouth of God, and not rely on the religious philosophies of the "Many" who transform themselves into Apostles of Christ that Jesus and Paul and the Prophets warned about.
Not only was the Law of no value to non-Israelites it came to be of no value to Israelites, as well, since Jesus condemned the Temple worship in view of his own crucifixion.
The Jesus "of the Bible" never condemned God's Commandments and Judgments. He condemned the religious philosophies of those who
profess that they know God; but in works they deny him, being abominable, and disobedient, and unto every good work reprobate.
And it is written;
Is. 66:
1 Thus saith the LORD, The heaven is my throne, and the earth is my footstool: where is the house that ye build unto me? and where is the place of my rest? 2 For all those things hath mine hand made, and all those things have been, saith the LORD: but to this man will I look, even to him that is poor and of a contrite spirit, and trembleth at my word.
The truly Faithful servants of God knew this.
Acts 7:
47 But Solomon built him an house. 48 Howbeit the most High dwelleth not in temples made with hands; as saith the prophet, 49 Heaven is my throne, and earth is my footstool: what house will ye build me? saith the Lord: or what is the place of my rest?
The deceiver would have us believe His Son Jesus, came to correct His Father and destroy His Father Commandments and Judgments that HE made for man, for their own "Good". The deceiver omits the Biblical fact that the those who professed to know God in His Time, had turned the Temple into a religious business. It wasn't God's Law that Jesus Condemned, it was the religious men who HE said
Full well ye reject the commandment of God, that ye may keep your own tradition.
Not only did continued animal sacrifices become superfluous next to his own sacrifice, but it came to be an insult to him to continue with a system that was intended to be fulfilled in him.
It is true that God "ADDED" Law regarding
concerning burnt offerings or sacrifices: for sin, because of Transgressions, "Till the SEED (Lamb of God) should come". As it is written;
Jer. 7:
22 For I spake not unto your fathers, nor commanded them in the day that I brought them out of the land of Egypt, concerning burnt offerings or sacrifices: 23 But this thing commanded I them, saying, Obey my voice, and I will be your God, and ye shall be my people: and walk ye in all the ways that I have commanded you, that it may be well unto you.
And truly the Lamb of God did come and HE Fulfilled the LAW of Sacrifice according to the Promises in the New covenant of God.
"
for I will forgive their iniquity, and I will remember their sin no more."
The deceiver would have us believe Jesus came to destroy God's entire Law because it was of no value to men. But it was this deception that led to Israel's transgression in the first place. As written, God's instruction was very beneficial to Abraham, Caleb, Joshua, and many repentant men who God deemed "Faithful". And since I believe in the Christ "of the Bible", I believe God's Laws were written for me as well.
Trying to tie Sabbath Law together with moral commands like "Do not murder" ignores the obvious inclusion of the 10 Commandments in the Temple Law, or the Old Covenant.
"Many" who call Jesus Lord, Lord, who "come in Christ's Name", have exalted themselves as a "Judge" of God and His Law, determining for themselves the morality of God and His Word. But the examples of faith given us in the holy scriptures didn't exalt themselves in this manner. If God said something was Holy, then it was Holy. If God said it was clean, then it was clean. If God esteems one day above another, who am I to challenge HIM. If God something was created for the good of man, then what HE created is good for man.
If God wants to change the Priesthood Covenant, HE made with Israel after the golden calf, that is, the manner in which HIS LAW is received, and the manner in which sins are forgiven, that is fine with me.
We may very well continue to obey such prohibitions as to "not murder," but we may not do that under a Temple system that has been abandoned.
As Paul said, you are free to "Yield yourself" a servant to whom you wish to obey. You have judged or at least implied that much of God's Law that Jesus walked in, was "not moral" in many instances and of no value to you or any man.
Those "Christians" in Matt. 7 most certainly believed in the same religious philosophy. I'm hoping you might consider these Biblical truths.