When I first came to the truth of the Bible and realized that we need to obey God's will to be saved, one of the things that I was unsure of, until I searched the scriptures, was whether or not I needed to keep the sabbath day or not. As I knew it was something God commanded the Israelites to keep. But was it something Christians needed to?
Scripture makes it clear that Christians do not have to keep the sabbath.
Colossians 2:16 KJB
"Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:"
From Ellicott's commentary on Colossians 2:16:
"It is obvious that St. Paul gives no hint of any succession of the Lord's Day to be, in any strict sense, a "Christian Sabbath." We know, indeed, that the Jewish Sabbath itself lingered in the Church, as having a kind of sacredness, kept sometimes as a fast, sometimes as a festival. But its observance was not of obligation. No man was to "judge" others in respect of it."
In the book of Acts in chapter 21 verse 25, Paul is speaking on things regarding the customs of the Jews, and what, if any, should the gentiles keep: "As touching the Gentiles which believe, we have written and concluded that they observe no such thing, save only that they keep themselves from things offered to idols, and from blood, and from strangled, and from fornication."
If the sabbath was something to be kept under the new covenant, it would have been mentioned there.
Those that are in Christ under grace through faith are not under the Law neither the commandments of Moses. Though I will say, besides the sabbath commandment, the other 9 commandments are taught (indirectly) in the New Testament.
Romans 6:14 KJB
"For sin shall not have dominion over you: for ye are not under the law, but under grace."