"And remember that you were a slave in the land of Egypt, and the Lord your God brought you out from there by a mighty hand and by an outstretched arm; therefore the Lord your God
commanded you to keep the Sabbath day." Deuteronomy 5:15

The Sabbath is not only the memorial day of Creation but also the memorial day of Salvation. Therefore if you are saved by the blood of Jesus you will keep the Sabbath holy.

"If you love Me, keep My commandments!" John 14:15