By the seventh day God finished what he had been doing and stopped working. He blessed the seventh day and set it apart as a special day, because by that day he had completed his creation and stopped working. Genesis 2:2-3 GNT
God set the seventh day apart and made it a special day. He sanctified it (made it holy), not to rest in the traditional sense, but to abstain from the regular order of the other six days. It is a time of reflecting on the majesty of our Creator, on the beauty of His creation, and of realigning ourselves to His created order and will.
Sabbath observance was a command given to God’s chosen people, Israel, that they would eternize God’s creative acts through rest and excogitation. It is also a reminder to Christians to enter the spiritual rest God has provided through the Jesus the Messiah.