Every week religious Jews observe the Sabbath, the Jewish holy day, and keep its laws and customs. The Sabbath begins at nightfall on Friday and lasts until nightfall on Saturday. ... God commanded the Jewish People to observe the Sabbath and keep it holy as the fourth of the Ten Commandments.
Does Shabbat happen every week?
Shabbat happens each week from sunset on Friday to sunset on Saturday. During Shabbat, Jewish people remember the story of creation from the Torah where God created the world in 6 days and rested on the 7th day. Different Jewish people celebrate Shabbat in different ways.
Who changed the Sabbath from Saturday to Sunday?
It was Emperor Constantine who decreed that Christians should no longer keep the Sabbath and keep only to Sunday (the latter part of the first day of the week) calling it the "Venerable Day of the Sun".