Exodus 20:8

Remember the Sabbath-day to keep it holy. This commandment presupposes a knowledge of the Sabbath, but not of its formal celebration. All those that urge the keeping of the Sabbath according to the Jewish pattern with the argument that this day and this form were included in the will of God as written into the hearts of men at the beginning, overlook or ignore the facts of history as found in the Book of Exodus. The deliberate setting aside of this special day of the week and the form of observance of this day as outlined to the Jews was intended for them only.