But with him that standeth here with us this day before the LORD our God, and also with him {h} that is not here with us this day:

(h) Meaning, their posterity.

Wesley's Notes

29:15 So also - With your posterity. For so the covenant was made at first with Abraham and his seed, by which as God engaged himself to continue the blessing of Abraham upon his posterity, so he also engaged them to the same duties which were required of Abraham. So it is even among men, where a king confers an estate upon a subject and his heirs for ever, upon some certain conditions, all his heirs who enjoy that benefit, are obliged to the same conditions. It may likewise include those who were then constrained to be absent, by sickness, or any necessary occasion. Nay one of the Chaldee pharaphrasts reads it, all the generations that have been from the first days of the world, and all that shall arise to the end of the whole world, stand with us here this day. And so taking this covenant as a typical dispensation of the covenant of grace, 'tis a noble testimony to the Mediator of that covenant, who is the same yesterday, to day, and for ever.

Matthew Henry's Concise Commentary

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.