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First Christians were Jews which kept the Sabbath and didn't eat unclean meat (even Jesus kept the Sabbath). Then later Christians changed many practices and diverged from the first teachings. During Reformation attempts were made to come back to original Christianity. Seventh-day Adventists for example keep the Sabbath holy and don't eat unclean meat - just like Jesus did! And there are also some other, smaller denominations which also keep the Sabbath holy - like Seventh-Day Baptists.