41 Now, Israel, listen to the statutes and to the ordinances, which I teach you, to do them; that you may live, and go in and possess the land which Yahweh, the God of your fathers, gives you. 2 You shall not add to the word which I command you, neither shall you diminish from it, that you may keep the commandments of Yahweh your God which I command you. 3 Your eyes have seen what Yahweh did because of Baal Peor; for all the men who followed Baal Peor, Yahweh your God has destroyed them from the midst of you. 4 But you who did cling to Yahweh your God are all alive this day. 5 Behold, I have taught you statutes and ordinances, even as Yahweh my God commanded me, that you should do so in the midst of the land where you go in to possess it. 6 Keep therefore and do them; for this is your wisdom and your understanding in the sight of the peoples, who shall hear all these statutes, and say, “Surely this great nation is a wise and understanding people.” 7 For what great nation is there, that has a god so near to them, as Yahweh our God is whenever we call on him? 8 What great nation is there, that has statutes and ordinances so righteous as all this law, which I set before you this day?
9 Only take heed to yourself, and keep your soul diligently, lest you forget the things which your eyes saw, and lest they depart from your heart all the days of your life; but make them known to your children and your children’s children;
Matthew Henry's Commentary on Deuteronomy 4:1-9
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.