First Jesus did not say the Deuteronomy 6:4-5 plus Leviticus 19:18 are the summation of the 10 Commandments, he said that upon these two depend (hang) the entire law and all the prophets and neither Deuteronomy 6:4-5 or Leviticus 19:18 are part of the 10 Commandments, which are found in Exodus 20:1-17 and Deuteronomy 5:6-21. In other words Jesus elevated two other commandments found in the Law above the entire Law and all the prophets.
Ephesians 2:15 does not deal with just the ceremonial law:
Ephesians 2:11-22
11 Therefore remember, that formerly you, the Gentiles in the flesh, who are called "Uncircumcision" by the so-called "Circumcision," which is performed in the flesh by human hands-- 12 remember that you were at that time separate from Christ, excluded from the commonwealth of Israel, and strangers to the covenants of promise, having no hope and without God in the world. 13 But now in Christ Jesus you who formerly were far off have been brought near by the blood of Christ. 14 For He Himself is our peace, who made both groups into one, and broke down the barrier of the dividing wall, 15 by abolishing in His flesh the enmity, which is the Law of commandments contained in ordinances, that in Himself He might make the two into one new man, thus establishing peace, 16 and might reconcile them both in one body to God through the cross, by it having put to death the enmity. 17 And He came and preached peace to you who were far away, and peace to those who were near; 18 for through Him we both have our access in one Spirit to the Father. 19 So then you are no longer strangers and aliens, but you are fellow citizens with the saints, and are of God's household, 20 having been built upon the foundation of the apostles and prophets, Christ Jesus Himself being the corner stone, 21 in whom the whole building, being fitted together is growing into a holy temple in the Lord; 22 in whom you also are being built together into a dwelling of God in the Spirit.
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Leviticus 1:1-3 does not tell us the Law was spoken by Moses, those three verses tell us:
Leviticus 1:1-3
1:1 Then the LORD called to Moses and spoke to him from the tent of meeting, saying, 2 "Speak to the sons of Israel and say to them, 'When any man of you brings an offering to the LORD, you shall bring your offering of animals from the herd or the flock. 3'If his offering is a burnt offering from the herd, he shall offer it, a male without defect; he shall offer it at the doorway of the tent of meeting, that he may be accepted before the LORD. NAS
God dictated the ceremonial as well as the moral law (Leviticus 18) to Moses who then repeated those laws to the sons of Israel and also wrote them in a scroll. (Exodus 24:4, Deuteronomy 31:9).
You eisegesis of James 2:8 and etc. only exposes the fact you are interpreting various passages to suit your agenda. The Royal Law is according to James “love your neighbor as yourself”, which Paul refers to as the fulfillment of the law (Romans 13:8-10, Galatians 5:4). In Colossians 2 Paul addresses not only the Jewish holy days (heortees), new moons (neomeenias), which are Sabbaths (sabbatoon), he includes Sabbaths (sabbatoon, the word “days“ is not found in the Greek) he addresses the dietary laws, and drink (posei) which are not part of the ceremonial law.
Acts 20:7 is not the only Scripture that refers to the “first day of the week”. In Mark 16:19 “prootee sabbatou” is translated “first day of the week”. “Sabbaton” is a feminine noun in Greek and in Greek all nouns agree in case and gender as indicated by word endings. In Matthew 28:1 the Greek reads “opse de sabbatoon” at the beginning of the verse and “mein sabbatoon” towards the end. The literal meaning of “opese de sabbatoon” is “at the end the Sabbaths” while “mein sabbatoon” means “first Sabbaths” and is a Hebrew idiom for the first day of the week, which was Sunday on the Roman calendar. In Acts 15 the Council of Jerusalem exempted gentiles from observing many parts of the Law, which was given to the sons of Israel not the whole human race.
In Romans Paul makes this clear:
Romans 13:8-10
8 Owe nothing to anyone except to love one another; for he who loves his neighbor has fulfilled the law. 9 For this, "You shall not commit adultery, You shall not murder, You shall not steal, You shall not covet," and if there is any other commandment, it is summed up in this saying, "You shall love your neighbor as yourself." 10 Love does no wrong to a neighbor; love therefore is the fulfillment of the law.
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Romans 14:1-10
14:1 Now accept the one who is weak in faith, but not for the purpose of passing judgment on his opinions. 2 One man has faith that he may eat all things, but he who is weak eats vegetables only. 3 Let not him who eats regard with contempt him who does not eat, and let not him who does not eat judge him who eats, for God has accepted him. 4 Who are you to judge the servant of another? To his own master he stands or falls; and stand he will, for the Lord is able to make him stand. 5 One man regards one day above another, another regards every day alike. Let each man be fully convinced in his own mind. 6 He who observes the day, observes it for the Lord, and he who eats, does so for the Lord, for he gives thanks to God; and he who eats not, for the Lord he does not eat, and gives thanks to God. 7 For not one of us lives for himself, and not one dies for himself; 8 for if we live, we live for the Lord, or if we die, we die for the Lord; therefore whether we live or die, we are the Lord's. 9 For to this end Christ died and lived again, that He might be Lord both of the dead and of the living. 10 But you, why do you judge your brother? Or you again, why do you regard your brother with contempt? For we shall all stand before the judgment seat of God. NAS
Sabbatarians have interpreted the Scripture to put themselves under the preamble to the Law (the 10 Commandments), while ignoring:
James 2:10-13
10 For whoever keeps the whole law and yet stumbles in one point, he has become guilty of all. 11 For He who said, "Do not commit adultery," also said, "Do not commit murder." Now if you do not commit adultery, but do commit murder, you have become a transgressor of the law. 12 So speak and so act, as those who are to be judged by the law of liberty. 13 For judgment will be merciless to one who has shown no mercy; mercy triumphs over judgment. NAS
Jesus equated lust with adultery and anger with murder, therefore if you are angry at anyone for any reason you are guilty of violating all 10 of the 10 Commandments. If you covet anything you are guilty of the whole law, not just the 10 Commandments.
The Lord’s sacrifice released us from the Law.