Genesis 17:7

Here is, I. The continuance of the covenant, intimated in three things: - 1. It is established; not to be altered nor revoked. It is fixed, it is ratified, it is made as firm as the divine power and truth can make it. 2. It is entailed; it is a covenant, not with Abraham only (then it would die with him), but with his seed after him, not only his seed after the flesh, but his spiritual seed. 3. It is everlasting in the evangelical sense and 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 of Christ's seed in every age. II. The contents of the covenant: it is a covenant of promises, exceedingly great and precious promises. Here are two which indeed are all-sufficient: - 1. That God would be their God, Gen 17:7, Gen 17:8. 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: his wisdom theirs, to guide and counsel them; his power theirs, to protect and support them; his goodness theirs, to supply and comfort them.

— Matthew Henry's Concise Commentary (public domain)