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Also, interestingly, all this passage says about the Sabbath is that we aren't supposed to work. The word Sabbath means "to cease"...to cease laboring, as God did on the 7th day. So, as to my post above, I guess I could have better stated that Saturday is the Sabbath, but Sunday is the Lord's Day. Sunday, as the Lord's Day, is more important than our time to rest and is more appropriate for the worship of the Lord who rose on that day.
In all four gospels we see a chapter devoted to the work that Jesus did on the Sabbath day, but Jesus declares Himself "Lord of the Sabbath" and "My Father worketh hitherto, and I work"...
That is very clear Jesus Christ worked on the Sabbath, the Jews persecuted the Lord for this and sought His death for breaking the Sabbath, But Jesus worked in the fields, healed, etc, on the Sabbath day. So what is the answer here? Is Saturday the Sabbath? the Jews say yes, Saturday is the Sabbath, but Jesus says no; "My Father works, and I work" - on the Sabbath Day, "the Sabbath was made for man, not man for the Sabbath". OK so Hebrews 4:9-10 gives us conclusion to know that
"Therefore remaineth a rest to the people of God (Christians). For he that entered into his rest, he also hath ceased from his works, as God did from His."
Notice there is now no mention of Sabbath or day, it's rest but no indication as to which day, it's not a calander day of rest, it's every day now for the Christian has ceased from all old works and has already entered into the Lord's rest. And then; Romans 14:5-6 and then Acts 20:7 explains coming together for the breaking of the bread, preaching, fellowship, and it's the first day - Sunday. But as it is also written it does not neccessarily have to be Sunday, but to follow the lead of the Apostles would be prudent, but whether a work day or a rest day or a holy day, it is now counted by God that that is everyday.