The Law of Moses or the Mosaic Law encompasses the first five books of the Bible (Genesis, Exodus, Leviticus, Numbers Deuteronomy), and at times are just referred to as the Law. However, in an extended sense, the whole of the Old Testament is known as the Mosaic Law. The Jews though consider the Law to be divided into three sections: (1) the Law of Moses, (3) the prophets and (3) the Psalms.
GENESIS 1:1-2:3: The Sabbath Day of Rest
The Hebrew word for “seventh” comes from a root meaning, “to be full, complete, entirely made up.” God “blessed” the seventh day by setting it apart as different from the others.