To such as keep his covenant - To such as adhere to the arrangements of his covenant, or who are faithful on their part. God will be faithful to his part of the covenant; and where there is fidelity on the part of his people, the blessings implied in the covenant will be conferred on them and on their children. The promise is ample, and the fidelity of God is certain, but still it is true that in those promises, and in that fidelity, it is implied that his people on their part must be faithful also, or the blessings will not be bestowed. There are no promises of blessings to the unfaithful, nor have those who are unfaithful any reason to hope that they or theirs will be partakers of the blessings of the covenant of mercy. Our only hope that we or our children will be partakers of the blessings of the covenant is to be found in the fact that we ourselves are faithful to God.
And to those that remember his commandments to do them - Who do not "forget" his law. If they do forget it, they have no right to expect the blessing. Obedience and fidelity are our only reasonable grounds of expectation of the blessing of God.

To such as keep his convenant - The spirit of which was, I will be your God; We will be thy People. From the covenant came the commandments, and their obligation to remember and do them; and on such keepers of the covenant, and doers of the commandments, God promises to pour out his mercy through all generations.

To such as keep his (l) covenant, and to those that remember his commandments to do them.
(l) To whom he gives grace to fear him, and to obey his word.

To such as keep his covenant,.... The covenant of grace, which is peculiarly the Lord's covenant, as distinct from man's; and which he keeps himself, and is ever mindful of it. This he makes known to his people at conversion; his secret is with them, and he shows them his covenant; the blessings and promises of it; their interest in them, and in himself, as their covenant God: which they "observe" (c), as the word here used signifies; and observing it, they lay hold upon it by faith, as belonging to them; and laying hold upon it, they "keep" it as their own, and keep it fast, and will not part with their interest in it for all the world.
And to those that remember his commandments to do them; some read them and hear them, but forget them, at least to do them: these are like a man that beholds his face in a glass, and forgets what manner of man he is; so James compares one that is a forgetful hearer, and not a doer of the word, James 1:23. The commandments of God are best remembered, so as to be done, when he puts his laws into the minds of men, and writes them in their hearts, and puts his Spirit within them, to cause them to walk in his statutes, and do them, Jeremiah 31:34.
(c) "observantes", Junius & Tremellius; so Piscator, Gejerus.

such . . . covenant--limits the general terms preceding.
righteousness--as usual (Psalm 7:17; Psalm 31:1).