Exodus 20:2

I am the Lord thy God — Herein, God asserts his own authority to enact this law; and proposeth himself as the sole object of that religious worship which is enjoined in the four first commandments. They are here bound to obedience. Because God is the Lord, Jehovah, self — existent, independent, eternal, and the fountain of all being and power; therefore he has an incontestable right to command us. He was their God; a God in covenant with them; their God by their own consent. He had brought them out of the land of Egypt — Therefore they were bound in gratitude to obey him, because he had brought them out of a grievous slavery into a glorious liberty. By redeeming them, he acquired a farther right to rule them; they owed their service to him, to whom they owed their freedom. And thus, Christ, having rescued us out of the bondage of sin, is entitled to the best service we can do him. The four first commandments, concern our duty to God (commonly called the first — table.) It was fit those should be put first, because man had a Maker to love before he had a neighbour to love, and justice and charity are then only acceptable to God when they flow from the principles of piety.