The Sabbath in the Book of Acts
After the death and resurrection of Yahusha/Jesus and the institution of the New Covenant with the outpouring of the Holy Spirit at Pentecost, the New Testament Church was formed, and we can begin to look for relevant information about Sabbath observance during the Church Age.
When the Sabbath is first mentioned in Acts 1:12, it is only in reference to the distance from Mt Olivet to Jerusalem being a Sabbath day’s journey (about 2000 cubits or 1 km).
When Paul went on Sabbath days into the synagogues at Pisidia (Acts 13:14,44), Thessalonica (Acts 17:2), and Corinth (Acts 18:4), he did so to reason with the Jews who gathered there on that day, still reading Moses (instead of Yahusha/Jesus!).
More significantly, when the Council of Jerusalem met to decide how much of the law of Moses should be expected of Gentile converts: "it seemed good to the Holy Spirit and to us (the disciples) to lay on you (the converts) no greater burden than these necessary things: that you abstain from things offered to idols, and from blood, and from things strangled, and from fornication; from which, if you keep yourselves, you shall do well" (Acts 15: 28-29).
There is no mention at all of keeping Sabbaths!