Listen now in the Hebraic context our Jewish Messiah quoted from the Torah He kept perfectly.
The two greatest commandments, from the Torah:
Devarim (Deut.) 6:5 "and you will love YHWH your elohim with all your heart, with all your being, and with all your resources.
Vayikra (Lev.) 19:18 "You will not take vengeance; nor hold a grudge against the sons of your people. But you will love your neighbor as yourself. I am YHWH.
Matthew Henry's Concise Commentary
Matthew 22:34-40 An interpreter of the law asked our Lord a question, to try, not so much his knowledge, as his judgment. The love of God is the first and great commandment, and the sum of all the commands of the first table. Our love of God must be sincere, not in word and tongue only. All our love is too little to bestow upon him, therefore all the powers of the soul must be engaged for him, and carried out toward him. To love our neighbour as ourselves, is the second great commandment. There is a self-love which is corrupt, and the root of the greatest sins, and it must be put off and mortified; but there is a self-love which is the rule of the greatest duty: we must have a due concern for the welfare of our own souls and bodies. And we must love our neighbour as truly and sincerely as we love ourselves; in many cases we must deny ourselves for the good of others. By these two commandments let our hearts be formed as by a mould.
Now what hapened to the 4th commandment? If accoding to Christian theologian like Matthew Henry can say that keeping the whole first tablet of the commandment is the evidence of our love for YHWH. So Exodus 20:8-9 Remember the Sabbath and it appart. Six days you labour, and shall do all your work, but the seventh day is a Shabbat of YHWH your Elohim. You do not do any work - you, nor your son, not your daughter, nor your male servant, nor your female servant, nor your cattle, nor your stranger who is withing your gates. For in six days YHWH made the heavens and the earth, the sea, and all that is in them, and rested on the seventh day. Therefore YHWH blessed the Sabbath day and set it appart.
Lets look now some more proof from theologians and publications of the church as to what is their beleif. i wonder why they do other that what the bible teaches.
"There is nothing in Scripture that requires us to keep Sunday rather than Saturday as a holy day." Harold Lindsell, Christianity Today, November 5, 1976
"There was and is a command to keep holy the Sabbath day, but that Sabbath day was not Sunday. It will however be readily said, and with some show of triumph, that the Sabbath was transferred from the seventh to the first day of the week, with all its duties, privileges and sanctions. Earnestly desiring information on this subject, which I have studied for many years, I ask, where can the record of such a transaction be found: Not in the New Testament — absolutely not. There is no scriptural evidence of the change of the Sabbath institution from the seventh to the first day of the week." Dr. E. T. Hiscox, Baptist Manual
Of course I quite well know that Sunday did come into use in early Christian history as a religious day as we learn from the Christian Fathers and other sources. But what a pity that it comes branded with the mark of Paganism, and christened with the name of the sun-god, then adopted and sanctified by the Papal apostasy, and bequeathed as a sacred legacy to Protestantism." Dr. E. T. Hiscox, report of his sermon at the Baptist Minister's Convention, New York Examiner, November 16, 1893
"Protestants ... accept Sunday rather than Saturday as the day for public worship after the Catholic Church made the change... But the Protestant mind does not seem to realize that ... in observing Sunday, they are accepting the authority of the spokesman for the Church, the pope." Our Sunday Visitor, February 5, 1950
Which is the Sabbath day? Saturday is the Sabbath day. Why do we observe Sunday instead of Saturday? We observe Sunday instead of Saturday because the Catholic Church transferred the solemnity from Saturday to Sunday." Rev. Peter Geiermann C.S.S.R., The Convert's Catechism of Catholic Doctrine, p. 50
"The Sabbath was binding in Eden, and it has been in force ever since. This fourth commandment begins with the word 'remember,' showing that the Sabbath already existed when God wrote the law on the tables of stone at Sinai. How can men claim that this one commandment has been done away with when they will admit that the other nine are still binding?" D.L. Moody, Weighed and Wanting, p. 47
We could go on and on showing that no even the theologians could make the Sun-Day their day of worship a false doctrine. I did not say it. YHWH says it. Those that have chosen to be desobedient and rebelious against His Torah. The Word of YHWH is Perfect and those who keep it will be rewarded at the end. Have a blessed Shabbat Shalom!