The Seventh-day Adventist Church is a Protestant Christian group. It is different from most other Protestant groups because the followers believe that the seventh day of the week, Saturday, is the day to rest from working and worship God. The Bible calls this day the "Sabbath". The Sabbath is the seventh day of the week (Gen 2:1-3) in Judaism and in the Seventh-Day Adventist Church. This is why they are called "Seventh-day Adventists". Although the abbreviation "SDA" is commonly used, "Adventist" is the church's preferred shortening of "Seventh-day Adventist".