6-20. I am the Lord thy God--The word "Lord" is expressive of authority or dominion; and God, who by natural claim as well as by covenant relation was entitled to exercise supremacy over His people Israel, had a sovereign right to establish laws for their government. [See on Ex 20:2.] The commandments which follow are, with a few slight verbal alterations, the same as formerly recorded (Ex 20:1-17), and in some of them there is a distinct reference to that promulgation.

JFB.