The Synod of Laodicea in 383/384 was a local council of 37 bishops, however its conclusions reinforced main-stream trends of the Gentile Chrisitanity legalized at the 1st Council of Nicea under Emperor Constantin (still a Pagan in 325). Two canons of this Synod became crucial: the 29th one, outlawing one of G-d’s Commandments, which seemed most Jewish to the young Anti-Jewish Church, and (possibly, if not added later) the 60th one specifying a Biblical canon of Scriptures.

The Canon 29 sounds:
Christians must not judaize by resting on Sabbath, but MUST WORK on that day, rather honouring the Lord's Day;
AND IF they CAN, RESTING THEN as Christians.
But if any shall be found to be judaizers, LET THEM BE ANATHEMA from CHRIST.

This statement consistently continues cursing of Jewishness by Constantin in his letter to the Council of Nicea in 325. The aim was to become fully separated from the first Apostolic Church of Judea and to replace it with the Gentile Church, ostensibly itself being the first and Apostolic, in the name of corrected imaginable non-Jewish Christ.

Further on, the Canon 29 became post factum explained in the Roman Catholic Church as ostensibly keeping the Commandment, however in a shifted way on the 1st Day, commemorating Resurrection and re-creating of the world by Christ. 
Explanation that the 29th Canon ostensibly introduced rest on the 1st (Lord's) Day of the week, appears in comments of Constantinople canonist Theodore Balsamon (the 12th c.): “on that day they SHOULD abstain from manual labour and go to church”. 
This is lie, there is a word “if they can” (as Balsamon mentions further), but not “should”. Anathema was much more important for fathers of Laodicea, than G-d's Commandment: the Commandment of rest did not persist any more, it was outlawed by the Canon 29!
The error noticed, an ancient idea of the 1st Day merging with coming eschatological 8th Day of the Creation was useed after the II Vatican Council. This idea rivives a concept of the Eternal 8th Messianic Day of Rest, found in Talmud in turn.

Modern theologians try to correct the situation saying that Christ having fulfilled the Law, it has no more force, and everything becomes created anew after the Resurrection. 
This is lie in turn, because Matthew 5:17–88 states:
Think not that I am come to destroy the Law, or the prophets: I am not come to destroy, but to fulfil. For verify I say unto you, Till heaven and earth pass, one jote or one tittle shall in no wise pass from the Law, till ALL be fulfilled.
‘Till’ is emphasized twice, therefore ‘all’ means future coming of Christ, cf. Rev. 21:5: Behold I make ALL things new! As well as 22:7,12: Behold, I come quickly! Otherwise what sense could have the words ‘till heaven and earth pass’?
Till that Day of Lord, Day of Judgement, “remains Sabbatism to the people of G-d” (Hebrews 4:9), not any “rest” (say, on the 1st day of the week), but clearly σαββατισμός, Latin sabbatismus, without any doubt.
How can this be otherwise, if not only rest on the 7th day in Mosaic Law is grounded in G-d's rest long before the Mosaic Law, however JHS Himself clearly confirms sanctity of the 7th Day in His words forseeing time AFTER HIS ATONEMENT: Pray ye that your flight be not in the winter, neither on the Sabbath day (Matthew 24:20), Sabbath being deleted by some Greek ‘Anti-Judaizer’ in Mark 13:18 in times of Roman-Jewish war and Jewish revolts of 115–117 and 132-135, when the Jews became “contrary to all men” (1 Thess 2:15).
Finally, as Isaiah says in 40:28, “Hast though not known? Hast though not heard that the everlasting G-d, the L-rd, the Creator of ends of the earth, faineth not, neither is weary?”. If then one wants to find G-d's rest “from His all work which He had made” (Gen 2:2), this is JHS' rest in Grave on Sabbath Day after all his work of Atonement He had made.

One sees that the infringement of the Synod of Laodicea on one of the first, most important G-d's Commandments was an infringement on all Ten Commandments, still adopted by all branches of the Constantin Church of 325, while JHS Himself mentions the Ten Commandments in turn, not naming those concerning G-d in the beginning, as self-explanatory to every Jew, however adding Lev 19:18, what presumably seemed very important to His querist: If though wilt enter into life, keep the commandments /.../ Thou shalt do not murder, Thou shalt not commit adultery, Thou shalt not steal, Thouh shalt not bear false witness, Honour thy father and thy mother, Thou shalt love thy neighbour as thyself  (Matthew 19:17–19).

What then? –


1. Constantin the Great and Christ brought thee out of the yoke of Mosaic law.   Thou shalt have no other gods, if you can.
2. Thou shalt not make images, if you can.
3. Thou shalt not take the name of G-d in vain, if you can.
4. Do not remember the Sabbath day, rather rest next day, if you can.
5. Honour thy father and thy mother, if you can.
6. Thou shalt not murder, if you can.
7. Thou shalt not commit adultery, if you can.
8. Thou shalt not steal, if you can.
9.  Thou shalt not bear false witness, if you can.
10. Thou shalt not covet anything that is thy neighbours, if you can.