Observing the Sabbath is resting on the seventh day of the week. The Sabbath is a day of rest. As God rested on the seventh day, so should we each week.
God did not literally rest on the 7th Day. That's an embellishment of the commandment by relating it to God. God is not like a man to need rest.
This is as a Jew. Gentiles can convert or join God's covenant people, in covenant with God according to the covenant God made with the nation of Israel through the prophet Moses at Mount Sinai. I am a convert or a proselyte. Of Israel, of the United States of America, and a Christian. I study Torah, the TaNaKh, the Old Testament,the New Covenant or the Apostle's Writings, the whole Bible. I was a Christian before converting to Judaism and I still am. Is this a righteous proselyte? There has been sin in my life, but as a Christian I already accepted the truth of the whole Bible before studying Torah, the first five books of the Bible,even the Hebrew Bible or the Christian Bible. As a Christian there were still sin issues, that should not have been. As a Jew, there is the Torah and God's commands without wondering about sin, the definition of sin, or what sin is. God's Law tells us what sin is. This is why the Bible says that sin is transgression of the law. We are not to live in sin, but to live righteous lives.
Sorry Jacob, but you are either a Jew or a Christian. There is no such a thing as a Jewish-Christian or a Christian-Jew. At his time, Prophet Elijah had to struggle with the "Jews-for-Baal" who insisted with holding the Jewish identity while practicing the religion of Baal. Elijah said they were straddling the issue between God and Baal.(I kings 18:21) The bottom line is that Elijah ended up by executing 450 prophets of Baal and 400 prophets of Asherah.(I Kings 18:19)The lesson to derive from that today is that we are straddling the issue between Judaism and Christianity. Elijah would turn in the grave if the dead could know what is going on today, especially with "Jews-for-Jesus."
The new covenant was to be with the house of Israel and the house of Judah,
"Was to be" is wrong. It was, period with the House of Israel and the House of Judah. (Jeremiah 31:31)
and it came in Yeshua HaMashiach, Jesus the Christ. It is not like the old which the people broke. It is God's law written on hearts and minds. This is either the Law of Moses or something else.
It did not come in Jesus time. The New Covenant in other words, was the Jewish New World Order for the establishment of the Second Jewish Commonwealth at the time of Ezra.
But I observe Torah, the Law of Moses, though as a convert or a proselyte and therefore of Israel and practicing Judaism, whether of the tribe of Levi, and we have or there are the Ten Commandments and even the 613 commands of Torah and the 1050 commands of the New Testament, all to be observed or which we are to observe or we are observing or we observe. There are others throughout the Prophets and the Writings. I have never been to Israel.
Whenever you decide to make Aliyah, try to say the truth that you are both Jewish and Christian and they will never approve your application. I am telling you this for a fact. Could it be reminiscences from the time of Elijah? We never know.