The third strength of the Calendar-Day view is titled Fourth Commandment. The following is this point as excerpted from the PCA Report.
“The Calendar-Day view provides the basis for the theological logic of and is confirmed by the Fourth Commandment as recorded in Exodus 20:11, in which the seven-day cycle of work and rest is affirmed. “The Sabbath was made for man,” said our Lord Jesus (Mark 2:27).”
The seven-day cycle of work and rest are commanded by God as part of the 10 commandments. The reason for the Sabbath is clearly stated in Exodus 20:11: “ For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested on the seventh day: therefore the LORD blessed the Sabbath day, and hallowed it.” God establishes a cycle of work and rest for His people to follow.
The giving of the 10 Commandments initiates the Mosaic Covenant, a milestone in the history of the LORD’s people. The Biblical account of creation is listed as the reason for humankind to live by a cycle of work and rest. The first tablets of the law were written in stone by the LORD (Exodus 32:15 & 16). These tablets were broken by Moses in his anger at the people of God as the people worshiped the golden calf (Genesis 32:19). God then write a second set of tablets for Moses (Exodus 34:1 & 2).
The Old Testament has numerous references on what could and could not be done on the Sabbath. This discussion of what could and could not be done on the Sabbath was a significant element of Jesus’ interaction with the Jews.
The third strength of the Calendar –Day view is that this view is strongly tied to the Fourth Commandment. This view is based on the perspicuity of scripture and a plain reading of scripture. The Fourth Commandment was spoken by God, and then written by God not once but twice.