For in six days the LORD made the heavens and the earth, the sea, and all that is in them, and rested the Seventh Day. Therefore the LORD blessed the Sabbath day and hallowed it.(EXODUS 20:11)
This question is very important! Let’s look at some other time references (days, months, and years) first. A day is one rotation of the earth on its axis. A month ultimately comes from one revolution of the moon around the earth. A year comes from one revolution of the earth around the sun. A week (seven days) has nothing to do with any astronomical time reference. So where does a week come from? A week comes from the Bible, because God created in 6 days and He rested on the Seventh Day.
God, being God, didn’t need to rest. He did that for our benefit. In EXODUS 20:11, God explains that He created in six days and rested for one day as a basis for our workweek. This is why everyone works according to this pattern. Moses and the Israelites worked for 6 days and then rested on the Seventh Day (called the “Sabbath”). EXODUS 31:17 is another confirmation that God created in six normal days and not over the millions and billions of years taught in the secular media and education system. God’s Word can be trusted over any of these false myths that the earth is millions of years old.