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Early Christians honored the Sabbath on Saturday, the seventh day, and met again on Sunday (the "eighth" day, see Acts 20:7), to partake of the sacrament and celebrate Christ's resurrection. Later Paul de-emphasized the need to follow many Jewish laws/traditions. Eventually, following the publication of the first blue law by Constantine? in the 4th century A.D., Sunday became the Christian Sabbath.
A few Christian sects, notably the Seventh-Day Adventists, currently honor the Sabbath on Saturday, but most use Sunday.