16 "You know how we dwelt in the land of Egypt, and how we came through the midst of the nations through which you passed; 17 and you have seen their detestable things, their idols of wood and stone, of silver and gold, which were among them. 18 Beware lest there be among you a man or woman or family or tribe, whose heart turns away this day from the Lord our God to go and serve the gods of those nations; lest there be among you a root bearing poisonous and bitter fruit, 19 one who, when he hears the words of this sworn covenant, blesses himself in his heart, saying, 'I shall be safe, though I walk in the stubbornness of my heart.' This would lead to the sweeping away of moist and dry alike. 20 The Lord would not pardon him, but rather the anger of the Lord and his jealousy would smoke against that man, and the curses written in this book would settle upon him, and the Lord would blot out his name from under heaven.
Matthew Henry's Commentary on Deuteronomy 29:16-20
Commentary on Deuteronomy 29:10-21
(Read Deuteronomy 29:10-21)
The national covenant made with Israel, not only typified the covenant of grace made with true believers, but also represented the outward dispensation of the gospel. Those who have been enabled to consent to the Lord's new covenant of mercy and grace in Jesus Christ, and to give up themselves to be his people, should embrace every opportunity of renewing their open profession of relation to him, and their obligation to him, as the God of salvation, walking according thereto. The sinner is described as one whose heart turns away from his God; there the mischief begins, in the evil heart of unbelief, which inclines men to depart from the living God to dead idols. Even to this sin men are now tempted, when drawn aside by their own lusts and fancies. Such men are roots that bear gall and wormwood. They are weeds which, if let alone, overspread the whole field. Satan may for a time disguise this bitter morsel, so that thou shalt not have the natural taste of it, but at the last day, if not before, the true taste shall be discerned. Notice the sinner's security in sin. Though he hears the words of the curse, yet even then he thinks himself safe from the wrath of God. There is scarcely a threatening in all the book of God more dreadful than this. Oh that presumptuous sinners would read it, and tremble! for it is a real declaration of the wrath of God, against ungodliness and unrighteousness of man.