And on the seventh day God ended His work which He had done, and He rested on the seventh day from all His work which He had done. Then God blessed the seventh day and sanctified it, because in it He rested from all His work which God had created and made.
Genesis, the book of beginnings, recounts the six days of creation, followed by a seventh day of rest. By resting, God set the seventh day apart and made it holy. This act of creation is recounted again in the Fourth of the 10 Commandments, which is about the Sabbath day (Exodus 20:8-11). See more about this in “Did God Create the Sabbath in Genesis 2?”
Here’s more about the Sabbath from our Fundamental Belief “11. The Seventh-Day Sabbath”:
“The seventh day of the week is the Sabbath of the Lord our God, and on this day humans are commanded to rest from their labors and worship Him. Established and blessed by God at creation, the seventh day of the week begins at sunset on Friday and continues until sunset on Saturday. The Sabbath is an identifying sign and a perpetual covenant between God and His people. True Christians follow the example of Jesus Christ, the apostles and the New Testament Church in observing the seventh-day Sabbath.”