Those for the seventh day (which is called “sabbath” and “day of completion”) forbid the prince on that day to eat cooked fruits and birds, to change his garments, to legislate or appoint officeholders, to take medicine; and requires him to make his sacrifice to God on that day. There is another convincing proof that the Sabbath never was a merely Levitical institution which is found in the fact that in the very law of the Decalogue God commands its observance equally by Jews and Gentiles: “In it