Brother, you have asked the right question! God gave everyone the Sabbath at the beginning.
By the seventh day God had finished the work he had been doing; so on the seventh day he rested from all his work. Then God blessed the seventh day and made it holy, because on it he rested from all the work of creating that he had done. (Genesis 2:2-3 NIV)
We must "remember" that we are to keep the Sabbath holy because God made it holy at the beginning.
Remember the Sabbath day by keeping it holy. Six days you shall labor and do all your work, but the seventh day is a sabbath to the Lord your God. On it you shall not do any work, neither you, nor your son or daughter, nor your male or female servant, nor your animals, nor any foreigner residing in your towns. For in six days the Lord made the heavens and the earth, the sea, and all that is in them, but he rested on the seventh day. Therefore the Lord blessed the Sabbath day and made it holy. (Exodus 20:8-11 NIV)
It is an acknowledgment of our relationship with God, the creator, when you "remember" that we must keep the Sabbath holy because He made the Sabbath holy at the beginning. God should not have to demand it from us through a covenant, if we "remember" that we should keep the Sabbath holy because He made it holy at the beginning. United in our hope of the soon return of Jesus, Jorge