Blessed is the one who does this—
the person who holds it fast,
who keeps the Sabbath without desecrating it,
and keeps their hands from doing any evil. (NIV)
God commanded his people to rest and honor him on the Sabbath. He wants us to serve him every day, but he wants us to make one day special when we rest and focus our thoughts on him. For the Israelites, this special day was the Sabbath (Saturday).
Some Christians set Saturday aside as this special day, but many accept Sunday (the day of the week that Jesus rose from the dead) as the "Lord's Day," a day of rest and honor to God.