If his children - His posterity; his successors on the throne.

Forsake my law - If they are not regulated by it in the administration of their government, and in their private lives. It is here supposed that they might forsake his law, or fail to observe it; but still there is the assurance that the power would not depart permanently from the successors of David, but that it would be restored ultimately to that line, and be permanent and eternal.

And walk not in my judgements - And do not obey my commandments.

If his children forsake my law - See the notes on 2 Samuel 7:13, where this and some of the following verses are explained.

If his children forsake my law,.... The same with the seed before mentioned, the children of the Messiah: it is not said "if he forsakes", which cannot be supposed of Christ, because he knew no sin, nor did any; which yet might be supposed of David, had he been literally meant; but not he, nor his natural children, but the spiritual seed of mystical David, are here designed, who may sin, and do sin, of which there is too much proof and evidence; and who sin not only through infirmity, but sometimes very grossly, and which sins are here expressed by various phrases: they sometimes "forsake the law of God"; do not attend to it, as they should, as the rule of their walk and conversation; are remiss in their observance of it, and obedience to it, and transgress its precepts; or his "doctrine" (h), even the doctrine of the Gospel; which may be said to be forsaken when men grow indifferent to it; go off from it in any measure, drop their profession of it, or hold it remissly, or become careless in their attendance on it: forsaking the assembling together to hear it, in some sense, is a forsaking of it; and this the Lord takes notice of, and resents, in his people:

and walk not in my judgments; those laws of his house by which he judges, regulates, and governs his people; by which they are directed by him, as their Judge and Lawgiver, how to behave themselves in the church of God; and in which they are to walk, and continue in the observance of; and so to do is to walk as becomes the Gospel, and worthy of their calling; but to do otherwise is to walk disorderly; and such are cognizable by the Lord, and by his people.

(h) "verbum meaum revelatum", Gejerus; "legem et doctrinam meam", Michaelis.

Now follows the paraphrase of 2 Samuel 7:14, that the faithlessness of David's line in relation to the covenant shall not interfere with (annul) the faithfulness of God - a thought with which one might very naturally console one's self in the reign of Rehoboam. Because God has placed the house of David in a filial relationship to Himself, He will chastise the apostate members as a father chastises his son; cf. Proverbs 23:13. In 1 Chronicles 17:13 the chronicler omits the words of 2 Samuel 7:14 which there provide against perverted action (העוות) on the part of the seed of David; our Psalm proves their originality. But even if, as history shows, this means of chastisement should be ineffectual in the case of individuals, the house of David as such will nevertheless remain ever in a state of favour with Him. In Psalm 89:34 חסדּי לא־אפיר מעמּו corresponds to וחסדּי־לא־יסוּר ממּנּוּ in 2 Samuel 7:15 (lxx, Targum): the fut. Hiph. of פרר is otherwise always אפר; the conjecture אסיר is therefore natural, yet even the lxx translators (ου ̓ μὴ διασκεδάσω) had אפיר before them. שׁקּר בּ as in Psalm 44:18. The covenant with David is sacred with God: He will not profane it (חלּל, to loose the bonds of sanctity). He will fulfil what has gone forth from His lips, i.e., His vow, according to Deuteronomy 23:24 [23], cf. Numbers 30:3 [2]. One thing hath He sworn to David; not: once equals once for all (lxx), for what is introduced by Psalm 89:36 (cf. Psalm 27:4) and follows in Psalm 89:37, Psalm 89:38, is in reality one thing (as in Psalm 62:12, two). He hath sworn it per sanctitatem suam. Thus, and not in sanctuario meo, בּקדשׁי in this passage and Amos 4:2 (cf. on Psalm 60:8) is to be rendered, for elsewhere the expression is בּי, Genesis 22:16; Isaiah 45:23, or בּנפשׁו, Amos 6:8; Jeremiah 51:14, or בּשׁמי, Jeremiah 44:26, or בּימינו, Isaiah 62:8. It is true we do not read any set form of oath in 2 Samuel 7, 1 Chronicles 17, but just as Isaiah, Isaiah 54:9, takes the divine promise in Genesis 8:21 as an oath, so the promise so earnestly and most solemnly pledged to David may be accounted by Psalm-poesy (here and in Psalm 132:11), which reproduces the historical matter of fact, as a promise attested with an oath. With אם in Psalm 89:36 God asserts that He will not disappoint David in reference to this one thing, viz., the perpetuity of his throne. This shall stand for ever as the sun and moon; for these, though they may one day undergo a change (Psalm 102:27), shall nevertheless never be destroyed. In the presence of 2 Samuel 7:16 it looks as if Psalm 89:38 ought to be rendered: and as the witness in the clouds shall it (David's throne) be faithful (perpetual). By the witness in the clouds one would then have to understand the rainbow as the celestial memorial and sign of an everlasting covenant. Thus Luther, Geier, Schmid, and others. But neither this rendering, nor the more natural one, "and as the perpetual, faithful witness in the clouds," is admissible in connection with the absence of the כּ of comparison. Accordingly Hengstenberg, following the example of Jewish expositors, renders: "and the witness in the clouds is perpetual," viz., the moon, so that the continuance of the Davidic line would be associated with the moon, just as the continuance of the condemned earth is with the rainbow. But in what sense would the moon have the name, without example elsewhere, of witness? Just as the Book of Job was the key to the conclusion of Psalm 88, so it is the key to this ambiguous verse of the Psalm before us. It has to be explained according to Job 16:19, where Job says: "Behold in heaven is my witness, and my surety in the heights." Jahve, the אל נאמן (Deuteronomy 7:9), seals His sworn promise with the words, "and the witness in the sky (ethereal heights) is faithful" (cf. concerning this Waw in connection with asseverations, Ew. 340, c). Hengstenberg's objection, that Jahve cannot be called His own witness, is disposed of by the fact that עד frequently signifies the person who testifies anything concerning himself; in this sense, in fact, the whole Tra is called עדוּת ה (the testimony of Jahve).

If his children forsake my law, and walk not in my judgments;

89:19-37 The Lord anointed David with the holy oil, not only as an emblem of the graces and gifts he received, but as a type of Christ, the King Priest, and Prophet, anointed with the Holy Ghost without measure. David after his anointing, was persecuted, but none could gain advantage against him. Yet all this was a faint shadow of the Redeemer's sufferings, deliverance, glory, and authority, in whom alone these predictions and promises are fully brought to pass. He is the mighty God. This is the Redeemer appointed for us, who alone is able to complete the work of our salvation. Let us seek an interest in these blessings, by the witness of the Holy Spirit in our hearts. As the Lord corrected the posterity of David for their transgressions, so his people shall be corrected for their sins. Yet it is but a rod, not a sword; it is to correct, not to destroy. It is a rod in the hand of God, who is wise, and knows what he does; gracious, and will do what is best. It is a rod which they shall never feel, but when there is need. As the sun and moon remain in heaven, whatever changes there seem to be in them, and again appear in due season; so the covenant of grace made in Christ, whatever alteration seems to come to it, should not be questioned.