From Our Reformed Doctrinal Standards
The Heidelberg Catechism
Questions and Answers 92-98
Q. 92. What is the law of God?
A. God spake all these words, Exodus 20, Deuteronomy 5, saying: I am the Lord thy God, which hath brought thee out of the land of Egypt, out of the house of bondage.
I. Thou shalt have no other gods before Me.
II. Thou shalt not make unto thyself any graven image, nor the likeness of any thing that is in heaven above, or in the earth beneath, or in the water under the earth. Thou shalt not bow down thyself to them, nor serve them; for I, the Lord thy God, am a jealous God, visiting the iniquity of the fathers upon the children, unto the third and fourth generation of them that hate Me, and showing mercy unto thousands of them that love Me, and keep My commandments.
III. Thou shalt not take the Name of the Lord thy God in vain; for the Lord will not hold him guiltless, that taketh His Name in vain.
IV. Remember the Sabbath Day, to keep it holy; six days shalt thou labor and do all thy work; but the seventh day is the Sabbath of the Lord thy God; in it thou shalt do no manner of work, thou, nor thy son, nor thy daughter, thy man servant, nor thy maid servant, nor thy cattle, nor thy stranger that is within thy gates. For in six days the Lord made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the Lord blessed the Sabbath Day, and hallowed it.