WLC Q.93: What is the moral law?
The moral law is the declaration of the will of God to mankind, directing and binding every one to personal, perfect, and perpetual conformity and obedience thereunto, in the frame and disposition of the whole man, soul and body, (Deut. 5:1–3,31,33, Luke 10:26–27, Gal. 3:10, 1 Thess. 5:23) and in performance of all those duties of holiness and righteousness which he oweth to God and man: (Luke 1:75, Acts 24:16) promising life upon the fulfilling, and threatening death upon the breach of it. (Rom. 10:5, Gal. 3:10,12)