(18) Lest there should be.--The connection with Deuteronomy 29:15 seems to be this. "I make this covenant binding with all your generations, in case there should even now be any root of idolatry among you which may grow up and bring forth fruit in later times, and bring a curse upon your whole country." That there were such roots of idolatry is only too plain from Deuteronomy 31:16, and from what followed after the death of the elders of this generation. (Comp. Judges 2:10-12.)

A root that beareth gall and wormwood.--The same two words occur in Lamentations 3:19, and one of them (gall) in Psalm 69:21. From whatever root it came, there was One to whom it was given to drink. The LXX. form of this expression, "lest there is among you any root that springeth up in gall and bitterness," is incorporated into the warning in Hebrews 12:15 : "Looking diligently, lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled."

Verse 18. - Lest there should be among you; rather, See that there be not among you, etc. The part. פֵן, lest, at the beginning of a sentence, sometimes implies a prohibition or dissuasion, as Job 32:13, "say not;" Isaiah 36:18," beware of saying" (Gesenius, Noldius in voc.). Gall. The Hebrew word so rendered (רלֺאשׁ) is supposed by Gesenius to be the poppy plant, by Celsius to be the hemlock (it is so rendered, Hosea 10:4; Amos 6:12, and by AEdman to be colocynth. It is probably a general name for what is poisonous and bitter; for it is used of poison generally (Deuteronomy 32:32) and of the venom of asps (Deuteronomy 32:33; Job 20:16), as well as of poisonous roots and bitter fruits (see Kitto, 'Bibl. Cycl.,' 3:701). Coupled here with wormwood, it must be a plant that is referred to; and the union of the two affords "a striking image of the destructive fruit borne by idolatry" (Keil).

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.Lest there should be among you man or woman, or family, or tribe,.... These words stand in connection with Deuteronomy 29:15, with Deuteronomy 29:16 being in a parenthesis, as may be observed, and show the design of this solemn appearance of the people, and their entering afresh into covenant; which was to prevent their falling into idolatry, and preserve them from it, whether a single person of either sex, or a whole family, or even a tribe, which might be in danger of being infected with it, and so all the people:

whose heart turneth away this day from the Lord our God, to go and serve the gods of those nations; whose heart is enticed and drawn aside at the remembrance of the idols he has seen worshipped by others; and is looking off from the Lord God, his faith in him being weakened, his fear of him removed, and his affections for him lessened; and is looking towards the idols of the nations, with a hankering mind to serve and worship them:

lest there should be among you a root that beareth gall and wormwood: the word "rosh", which we render "gall", signifies, according to Jarchi, a bitter herb, which better suits with a root than gall, and is elsewhere by us rendered "hemlock", Hosea 10:4; and is by him very rightly interpreted of a wicked man among them; for not a principle of immorality, or heresy, rooted in the mind, productive of bitter fruits, or evil actions, is meant; but a bad man, particularly an idolater, who is rooted in idolatry, and is guilty of and commits abominable actions; the issue of which will be bitterness and death, if not recovered; which agrees with what the apostle says, Hebrews 12:15; who manifestly alludes to this passage; see the Apocrypha:"In those days went there out of Israel wicked men, who persuaded many, saying, Let us go and make a covenant with the heathen that are round about us: for since we departed from them we have had much sorrow.'' (1 Maccabees 1:11)and is confirmed by what follows.