The seventh day of the week, commanded by God in the Old Testament as a sacred day of rest after his creation of the world; in Judaism, from sunset Friday to sunset Saturday; in Christianity, Sunday (or, in some sects, Saturday). Keeping the Sabbath is one of the Ten Commandments.
Some Christians regard Sunday as the first day of the week but celebrate it as the Sabbath because it was said to be the day of the Resurrection of Jesus.
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