Do good to Zion in thy good pleasure: build thou the walls of Jerusalem [1] From prayer in his own behalf he now proceeds to offer up supplications for the collective Church of God, a duty which he may have felt to be the more incumbent upon him from the circumstance of his having done what he could by his fall to ruin it, Raised to the throne, and originally anointed to be king for the very purpose of fostering the Church of God, he had by his disgraceful conduct nearly accomplished its destruction. Although chargeable with this guilt, he now prays that God would restore it in the exercise of his free mercy. He makes no mention of the righteousness of others, but rests his plea entirely upon the good pleasure of God, intimating that the Church, when at any period it has been brought low, must be indebted for its restoration solely to Divine grace. Jerusalem was already built, but David prays that God would build it still farther for he knew that it fell far short of being complete, so long as it wanted the temple, where he had promised to establish the Ark of his Covenant, and also the royal palace. We learn from the passage, that it is God's own work to build the Church. "His foundation," says the Psalmist elsewhere, "is in the holy mountains," (Psalm 87:1.) We are not to imagine that David refers simply to the Church as a material structure, but must consider him as having his eye fixed upon the spiritual temple, which cannot be raised by human skill or industry. It is true, indeed, that men will not make progress even in the building of material walls, unless their labor be blessed from above; but the Church is in a peculiar sense the erection of God, who has founded it upon the earth in the exercise of his mighty power, and who will exalt it higher than the heavens. In this prayer David does not contemplate the welfare of the Church for a short period merely, but prays that God would preserve and advance it till the coming of Christ. And here, may it not justly excite our surprise, to find one who, in the preceding part of the psalm, had employed the language of distress and almost of despair, now inspired with the confidence necessary for commending the whole Church to the care of God? How comes it about, may we not ask, that one who so narrowly escaped destruction himself, should now appear as a guide to conduct others to salvation? In this we have a striking proof, that, provided we obtain reconciliation with God, we may not only expect to be inspired with confidence in praying for our own salvation, but may hope to be admitted as intercessors in behalf of others, and even to be advanced to the higher honor still, of commending into the hands of God the glory of the Redeemer's kingdom.

Footnotes

1 - We have already considered Horsley's first objection, founded on the fourth verse, to the authenticity of the title of this psalm. His second and only other objection rests on the 18th verse. He thinks that the prayer, "Build thou the walls of Jerusalem," is more applicable to the time of the Babylonish captivity than to the time of David; and to the former period he refers the psalm. Calmet and Mudge are of the same opinion. Some learned Jewish interpreters, while they assign the psalm to the occasion mentioned in the title, conjecture that the 18th and 19th verses were added by some Jewish bard in the time of the Babylonish captivity. This opinion is also held by Venema, Green, Street, French and Skinner. There does not, however, seem to be any sufficient ground for referring the poem, either in whole or in part, to that period. Neither the walls of Jerusalem, nor the buildings of Zion, as the royal palace, and the magnificent structure of the temple, which we know David had already contemplated for the worship of God, (2 Samuel 7:1, etc.) were completed during his reign. This was only effected under the reign of his son Solomon, (1 Kings 3:1.) The prayer, then, in the 18th verse, might have a particular reference to the completion of these buildings, and especially to the rearing of the temple, in which sacrifices of unprecedented magnitude were to be offered. David's fears might easily suggest to him that his crimes might prevent the building of the temple which God had promised should be erected, (2 Samuel 7:13.) "The king forgets not," observes Bishop Horne, "to ask mercy for his people, as well as for himself; that so neither his own nor their sins might prevent either the building and flourishing of the earthly Jerusalem, or, what was of infinitely greater importance, the promised blessing of Messiah, who was to descend from him, and to rear the walls of the New Jerusalem."

Do good in thy good pleasure unto Zion - From himself - his deep sorrow, his conscious guilt, his earnest prayer for pardon and salvation - the psalmist turns to Zion, to the city of God, to the people of the Lord. These, after all, lay nearer to his heart than his own personal salvation; and to these his thoughts naturally turned even in connection with his own deep distress. Such a prayer as is here offered he would also be more naturally led to offer from the remembrance of the dishonor which he had brought on the cause of religion, and it was natural for him to pray that his own misconduct might not have the effect of hindering the cause of God in the world. The psalms often take this turn. Where they commence with a personal reference to the author himself, the thoughts often terminate in a reference to Zion, and to the promotion of the cause of religion in the world.
Build thou the walls of Jerusalem - It is this expression on which De Wette, Doederlein, and Rosenmuller rely in proof that this psalm, or this portion of it, was composed at a later period than the time of David, and that it must have been written in the time of the captivity, when Jerusalem was in ruins. See the introduction to the psalm. But, as was remarked there, it is not necessary to adopt this supposition. There are two other solutions of the difficulty, either of which would meet all that is implied in the language.
(a) One is, that the walls of Jerusalem, which David had undertaken to build, were not as yet complete, or that the public works commenced by him for the protection of the city had not been finished at the time of the fatal affair of Uriah. There is nothing in the history which forbids this supposition, and the language is such as would be used by David on the occasion, if he had been actually engaged in completing the walls of the city, and rendering it impregnable, and if his heart was intensely fixed on the completion of the work.
(b) The other supposition is, that this is figurative language - a prayer that God would favor and bless his people as if the city was to be protected by walls, and thus rendered safe from an attack by the enemy. Such language is, in fact, often used in cases where it could not be pretended that it was designed to be literal. See Jde 1:20; Romans 15:20; 1-Corinthians 3:12; Galatians 2:18; Ephesians 2:22; Colossians 2:7.

Do good in thy good pleasure unto Zion - This and the following verse most evidently refer to the time of the captivity, when the walls of Jerusalem were broken down, and the temple service entirely discontinued; and, consequently, are long posterior to the times of David. Hence it has been concluded that the Psalm was not composed by David, nor in his time and that the title must be that of some other Psalm inadvertently affixed to this. The fourth verse has also been considered as decisive against this title: but the note on that verse has considerably weakened, if not destroyed, that objection. I have been long of opinion that, whether the title be properly or improperly affixed to this Psalm, these two verses make no part of it: the subject is totally dissimilar; and there is no rule of analogy by which it can be interpreted as belonging to the Psalm, to the subject, or to the person. I think they originally made a Psalm of themselves, a kind of ejaculatory prayer for the redemption of the captives from Babylon, the rebuilding of Jerusalem, and the restoration of the temple worship. And, taken in this light, they are very proper and very expressive.
The Psalm 117:1-2 contains only two verses; and is an ejaculation of praise from the captives who had just then returned from Babylon. And it is a fact that this Psalm is written as a part of the cxvith in no less than thirty-two of Kennicott's and De Rossi's MSS.; and in some early editions. Again, because of its smallness, it has been absorbed by the cxviiith, of which it makes the commencement, in twenty-eight of Kennicott's and De Rossi's MSS. In a similar way I suppose the two last verses of this Psalm to have been absorbed by the preceding, which originally made a complete Psalm of themselves; and this absorption was the more easy, because, like the cxviith it has no title. I cannot allege a similar evidence relative to these two verses, as ever having made a distinct Psalm; but of the fact I can have no doubt, for the reasons assigned above. And I still think that Psalm is too dignified, too energetic, and too elegant, to have been the composition of any but David. It was not Asaph; it was not any of the sons of Korah; it was not Heman or Jeduthun: the hand and mind of a greater master are here.

Do good in thy good pleasure unto (p) Zion: build thou the walls of Jerusalem.
(p) He prays for the whole Church, because through his sin it was in danger of God's judgment.

Do good in thy good pleasure unto Zion,.... This verse, and Psalm 51:19, are thought, by a Spanish Rabbi mentioned by Aben Ezra, to have been added by one of the holy men that lived in the time of the Babylonish captivity; though rather it is thought, by the latter, to be written by David, under a spirit of prophecy, concerning, times to come; and so Kimchi thinks they are prophetic of future things; of the destruction of the first and second temple, and of the acceptableness of sacrifices in the times of the Messiah: and by Zion is meant the church, under the Gospel dispensation, Hebrews 12:22; and the "good" prayed for includes all the good and glorious things spoken of the church of Christ in the latter day; such as an increase of its numbers, the bringing in the fulness of the Gentiles, the conversion of the Jews, and the kingdoms of this world becoming the kingdoms of our Lord and of his Christ; the spread of the Gospel all over the world, the purity of Gospel doctrine, worship, and ordinances, the spirituality of religion, the power of godliness, and an abounding of brotherly love, and the like. The "good pleasure" of God, in which this is desired to be done, may denote either , "the acceptable time"; or "time of good pleasure"; the Gospel dispensation, so called Isaiah 49:8, in which it has been foretold, and may be expected these things shall be done; or else the cause, source, and spring of them, which is the sovereign good will and pleasure of God, from whence flow all the blessings of grace and goodness;
build thou the walls of Jerusalem; not literally taken; for these do not appear to have stood in need of being repaired or rebuilt in David's time; but the church of God, which is a spiritual house, built up of lively stones, true believers; which may be said to be more and more built up by an addition of such unto it: it is as a city compact together, whose walls are salvation, and its gates praise, Isaiah 26:1; of the wall of the new Jerusalem, see Revelation 21:12.

Do good, &c.--Visit not my sin on Thy Church.
build . . . walls--is to show favor; compare Psalm 89:40, for opposite form and idea.

From this spiritual sacrifice, well-pleasing to God, the Psalm now, in vv. 20f., comes back to the material sacrifices that are offered in a right state of mind; and this is to be explained by the consideration that David's prayer for himself here passes over into an intercession on behalf of all Israel: Do good in Thy good pleasure unto Zion. את־ may be a sign of the accusative, for היטיב (הטיב) does take the accusative of the person (Job 24:21); but also a preposition, for as it is construed with ל and עם, so also with את in the same signification (Jeremiah 18:10; Jeremiah 32:41). זבח־צדק are here, as in Psalm 4:6; Deuteronomy 33:19, those sacrifices which not merely as regards their outward character, but also in respect of the inward character of him who causes them to be offered on his behalf, are exactly such as God the Lawgiver will have them to be. By כּליל beside עולה might be understood the priestly vegetable whole-offering, Leviticus 6:15. (מנחת חבתּין, Epistle to the Hebrews, ii. 8), since every עולה as such is also כּליל; but Psalm-poetry does not make any such special reference to the sacrificial tra. וכליל is, like כליל in 1-Samuel 7:9, an explicative addition, and the combination is like ימינך וזרועך, Psalm 44:4, ארץ ותבל, Psalm 90:2, and the like. A שׁלם כּליל (Hitzig, after the Phoenician sacrificial tables) is unknown to the Israelitish sacrificial worship. The prayer: Build Thou the walls of Jerusalem, is not inadmissible in the mouth of David; since בּנה signifies not merely to build up what has been thrown down, but also to go on and finish building what is in the act of being built (Psalm 89:3); and, moreover, the wall built round about Jerusalem by Solomon (1-Kings 3:1) can be regarded as a fulfilment of David's prayer.
Nevertheless what even Theodoret has felt cannot be denied: τοῖς ἐν Βαβυλῶνι...ἁρμόττει τὰ ῥήματα. Through penitence the way of the exiles led back to Jerusalem. The supposition is very natural that vv. 20f. may be a liturgical addition made by the church of the Exile. And if the origin of Isaiah 40:1 in the time of the Exile were as indisputable as the reasons against such a position are forcible, then it would give support not merely to the derivation of vv. 20f. (cf. Isaiah 60:5, Isaiah 60:7, Isaiah 60:10), but of the whole Psalm, from the time of the Exile; for the general impress of the Psalm is, according to the accurate observation of Hitzig, thoroughly deutero-Isaianic. But the writer of Isaiah 40:1 shows signs in other respects also of the most families acquaintance with the earlier literature of the Shı̂r and the Mashal; and that he is none other than Isaiah reveals itself in connection with this Psalm by the echoes of this very Psalm, which are to be found not only in the second but also in the first part of the Isaianic collection of prophecy (cf. on Psalm 51:9, Psalm 51:18). We are therefore driven to the inference, that Ps 51 was a favourite Psalm of Isaiah's, and that, since the Isaianic echoes of it extend equally from the first verse to the last, it existed in the same complete form even in his day as in ours; and that consequently the close, just like the whole Psalm, so beautifully and touchingly expressed, is not the mere addition of a later age.

Good pleasure - Thy free and rich mercy. Build - Perfect the walls and buildings of that city, and especially let the temple be built, notwithstanding my sins.