12 Then the Lord spoke to you out of the fire. You heard the sound of words but saw no form; there was only a voice. 13 He declared to you his covenant, which he charged you to observe, that is, the ten commandments; and he wrote them on two stone tablets. 14 And the Lord charged me at that time to teach you statutes and ordinances for you to observe in the land that you are about to cross into and occupy.
15 Since you saw no form when the Lord spoke to you at Horeb out of the fire, take care and watch yourselves closely, 16 so that you do not act corruptly by making an idol for yourselves, in the form of any figure-the likeness of male or female, 17 the likeness of any animal that is on the earth, the likeness of any winged bird that flies in the air, 18 the likeness of anything that creeps on the ground, the likeness of any fish that is in the water under the earth. 19 And when you look up to the heavens and see the sun, the moon, and the stars, all the host of heaven, do not be led astray and bow down to them and serve them, things that the Lord your God has allotted to all the peoples everywhere under heaven.
Matthew Henry's Commentary on Deuteronomy 4:12-19
Commentary on Deuteronomy 4:1-23
(Read Deuteronomy 4:1-23)
The power and love of God to Israel are here made the ground and reason of a number of cautions and serious warnings; and although there is much reference to their national covenant, yet all may be applied to those who live under the gospel. What are laws made for but to be observed and obeyed? Our obedience as individuals cannot merit salvation; but it is the only evidence that we are partakers of the gift of God, which is eternal life through Jesus Christ, Considering how many temptations we are compassed with, and what corrupt desires we have in our bosoms, we have great need to keep our hearts with all diligence. Those cannot walk aright, who walk carelessly. Moses charges particularly to take heed of the sin of idolatry. He shows how weak the temptation would be to those who thought aright; for these pretended gods, the sun, moon, and stars, were only blessings which the Lord their God had imparted to all nations. It is absurd to worship them; shall we serve those that were made to serve us? Take heed lest ye forget the covenant of the Lord your God. We must take heed lest at any time we forget our religion. Care, caution, and watchfulness, are helps against a bad memory.