It is remarkable that the only mention of Sabbath-keeping in all the epistles comes in Colossians 2, where Paul identifies it as one of the requirements of Jewish law eclipsed in Christ. The apostle writes:
“Therefore let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath. These are a shadow of the things to come, but the substance belongs to Christ.”
The Sabbath, Paul says, was a shadow. That’s important.