One cannot reject something that no longer exists. Murder and theft were wrong all around the world before Moses, but keeping a sabbath was not. Neither was failing to sacrifice bulls, goats etc.
Keeping a sabbath applied to one tiny nation for a thousand years, and then was gone forever at the crucifixion.
Is that so?
Then why was it Paul's custom or manner to be in the synagogue on Sabbath?
Act 17:2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the Scriptures,
Act 18:4 And he reasoned in the synagogue every sabbath, and persuaded the Jews and the Greeks.
Act 13:42 And when the Jews were gone out of the synagogue, the Gentiles besought that these words might be preached to them the next sabbath.
Act 13:43 Now when the congregation was broken up, many of the Jews and religious proselytes followed Paul and Barnabas: who, speaking to them, persuaded them to continue in the grace of God.
Act 13:44 And the next sabbath day came almost the whole city together to hear the word of God.
Seems like the Sabbath was alive and well. And additionally Jesus expected for the Sabbath to be kept after his crucifixion. Speaking of the destruction of Jerusalem which happened in 70AD he said,
Mat 24:16 Then let them which be in Judea flee into the mountains:
Mat 24:17 Let him which is on the housetop not come down to take any thing out of his house:
Mat 24:18 Neither let him which is in the field return back to take his clothes.
Mat 24:19 And woe unto them that are with child, and to them that give suck in those days!
Mat 24:20 But pray ye that your flight be not in the winter,
neither on the sabbath day:
If Jesus didn't care about Sabbath observance after his death then why did he tell them this. Its obvious he cares.
The seventh-day sabbath is history, a shadow of the true sabbath, which is the whole Christian life. That must be kept holy, every day, all day.
This sounds nice but it is unbiblical. The bible doesn't say that. The seventh day Sabbath was not a shadow of anything. The ceremonial sabbaths and high holy days were.