Next, the spiritual part of the covenant comes into view. "To be a God unto thee, and to thy seed after thee." Here we find God, in the progress of human development, for the third time laying the foundations of a covenant of grace with man. He dealt with Adam and with Noah, and now be deals with Abraham. "A perpetual covenant." This covenant will not fail, since God has originated it, notwithstanding the moral instability of man. Though we cannot as yet see the possibility of fulfilling the condition on man's side, yet we may be assured that what God purposes will somehow be accomplished. The seed of Abraham will eventually embrace the whole human family in fellowship with God.

An everlasting covenant - ברית עולם berith olam. See note on Genesis 13:15. Here the word olam is taken in its own proper meaning, as the words immediately following prove - to be a God unto thee, and thy seed after thee; for as the soul is to endure for ever, so it shall eternally stand in need of the supporting power and energy of God; and as the reign of the Gospel dispensation shall be as long as sun and moon endure, and its consequences eternal, so must the covenant be on which these are founded.

And I will establish my covenant between me and thee,.... Not only renew it, but confirm it by the following token of circumcision:

and thy seed after thee, in their generation; such blessings in it as belonged to his natural seed, as such he confirmed to them, to be enjoyed by them in successive ages; and such as belonged to his spiritual seed, to them also, as they should be raised up in future times in one place and another:

for an everlasting covenant; to his natural seed, as long as they should continue in the true worship of God; and in their own land; or until the Messiah came, in whom the covenant of circumcision had its accomplishment, and was at an end; and to all his spiritual seed, with respect to the spiritual blessings of it, which are everlasting, and are never taken away, or become void:

to be a God unto thee, and to thy seed after thee; to his natural seed, as the God of nature and providence, communicating the good things of life unto them; protecting, preserving, and continuing them in the land he gave them, and in the possessive of all the good things in it, so long as they were obedient to him as their King and their God; and to his spiritual seed, as the God of all grace, supplying them with grace here, and bestowing upon them glory hereafter.

And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee.

17:7 And I will establish my covenant - Not to be altered or revoked; not with thee only, then it would die with thee but with thy seed after thee; and it is not only thy seed after the flesh, but thy spiritual seed. It is everlasting in the evangelical meaning of it. The covenant of grace is everlasting; it is from everlasting in the counsels of it, and to everlasting in the consequences of it; and the external administration of it is transmitted, with the seal of it, to the seed of believers, and the internal administration of it by the Spirit to Christ's seed in every age. This is a covenant of exceeding great and precious promises. Here are two which indeed are all - sufficient, that God would be their God. All the privileges of the covenant, all its joys, and all its hopes, are summed up in this. A man needs desire no more than this to make him happy. What God is himself, that he will be to his people: wisdom to guide and counsel them, power to protect and support them, goodness to supply and comfort them; what faithful worshippers can expect from the God they serve, believers shall find in God as theirs. This is enough, yet not all.

17:7-14 The covenant of grace is from everlasting in the counsels of it, and to everlasting in the consequences of it. The token of the covenant was circumcision. It is here said to be the covenant which Abraham and his seed must keep. Those who will have the Lord to be to them a God, must resolve to be to him a people. Not only Abraham and Isaac, and his posterity by Isaac, were to be circumcised, but also Ishmael and the bond-servants. It sealed not only the covenant of the land of Canaan to Isaac's posterity, but of heaven, through Christ, to the whole church of God. The outward sign is for the visible church; the inward seal of the Spirit is peculiar to those whom God knows to be believers, and he alone can know them. The religious observance of this institution was required, under a very severe penalty. It is dangerous to make light of Divine institutions, and to live in the neglect of them. The covenant in question was one that involved great blessings for the world in all future ages. Even the blessedness of Abraham himself, and all the rewards conferred upon him, were for Christ's sake. Abraham was justified, as we have seen, not by his own righteousness, but by faith in the promised Messiah.