Genesis 2:3 Here we see the Sabbath was before the law. God blessed the seventh day and sanctified it. He set it apart as holy.
Paul, a Hebrew of Hebrews who was sent by God to declare the Good News of overwhelming grace to the nations had this to say in his letter to the Colossians. Chapter 2: 16 - “Therefore no one is to act as your judge in regard to food or drink or in respect to a festival or a new moon or a Sabbath day- 17 things which are a mere shadow of what is to come ; but the substance belongs to Christ.”
The Sabbath is a mere shadow of what was to come. The substance belongs to Christ. The Greek transliteration of the word “substance” is “soma”. “Soma” is best defined as “body”. The body is Christ. The shadow He cast was a special day. The shadow was extending out from the body. We saw the shadow first and now we see the body. It is in Christ that we find true rest. As Jesus Himself promises, "Come to Me, all who are weary and heavy-laden, and I will give you rest.” (Matthew 11:28)