Jehovah building up, etc. He begins with the special mercy of God towards his Church and people, in choosing to adopt one nation out of all others, and selecting a fixed place where his name might be called upon. When he is here called the builder of Jerusalem, the allusion is not so much to the outward form and structure, as to the spiritual worship of God. It is a common figure in treating of the Church to speak of it as a building or temple. The meaning is, that the Church was not of human erection, but formed by the supernatural power of God; for it was from no dignity of the place itself that Jerusalem became the only habitation of God in our world, nor did it come to this honor by counsel, industry, effort or power of man, but because God was pleased to consecrate it to himself. He employed the labor and instrumentality of men indeed in erecting his sanctuary there, but this ought never to take from his grace, which alone distinguished the holy city from all others. In calling God the former and architect of the Church, his object is to make us aware that by his power it remains in a firm condition, or is restored when in ruins. Hence he infers that it is in his power and arbitrament to gather those who have been dispersed. Here the Psalmist would comfort those miserable exiles who had been scattered in various quarters, with the hope of being recovered from their dispersion, as God had not adopted them without a definite purpose into one body. As he had ordered his temple and altar to be erected at Jerusalem, and had fixed his seat there, the Psalmist would encourage the Jews who were exiles from their native country, to entertain good hope of a return, intimating that it was no less properly God's work to raise up his Church when ruined and fallen down, than to found it at first. It was not, therefore, the Psalmist's object directly to celebrate the free mercy of God in the first institution of the Church, but to argue from its original, that God would not suffer his Church altogether to fall, having once founded it with the design of preserving it for ever; for he forsakes not the work of his own hands. This comfort ought to be improved by ourselves at the present period, when we see the Church on every side so miserably rent asunder, leading us to hope that all the elect who have been adjoined to Christ's body, will be gathered unto the unity of the faith, although now scattered like members torn from one another, and that the mutilated body of the Church, which is daily distracted, will be restored to its entireness; for God will not suffer his work to fail. In the following verse he insists upon the same truth, the figure suggesting that though the Church labor under, and be oppressed by many diseases, God will speedily and easily recover it from all its wounds. The same truth, therefore, is evidently conveyed, under a different form of expression -- that the Church, though it may not always be in a flourishing condition, is ever safe and secure, and that God will miraculously heal it, as though it were a diseased body.

The Lord doth build up Jerusalem - He builds up the walls; he restores the city; he has caused the temple to be reconstructed. This language would be applicable to a return from the captivity. There may be an allusion here to the language in Psalm 102:16 : "When the Lord shall build up Zion, he shall appear in his glory." See the notes at that passage. What is there spoken of as what would be in the future is here spoken of as accomplished, and as a ground of praise.
He gathereth together the outcasts of Israel - Those who have been exiled from their native land, and who have been scattered as outcasts in a foreign country. This is appropriate language to use on the supposition that the psalm was composed after the return from the exile, for it is in such language that that return was predicted by the prophets. Isaiah 11:12 : "and he shall assemble the outcasts of Israel, and gather together the dispersed of Judah," etc. Isaiah 56:8 : "the Lord God which gathereth the outcasts of Israel," etc.

The Lord doth build up - The psalmist appears to see the walls rising under his eye, because the outcasts of Israel, those who had been in captivity, are now gathered together to do the work.

The LORD doth build up (b) Jerusalem: he gathereth together the outcasts of Israel.
(b) Because the Lord is the founder of the Church, it cannot be destroyed, though the members of it are dispersed and seem as it were for a time to be cut off.

The Lord doth build up Jerusalem,.... Literally, after the Babylonish captivity, according to some; or rather when taken from the Jebusites by David; or spiritually the church, which is often called Jerusalem, even the Gospel church, of which Christ is the builder, his ministers are instruments, his people are the materials, and which, though now greatly fallen to decay, will be rebuilt by him in the latter day; when his work will be revived among his saints, his Gospel more powerfully preached, his ordinances more purely administered, and multitudes of souls converted; and which will be matter of praise and thanksgiving, as it is now matter of prayer; see Psalm 51:18;
he gathereth together the outcasts of Israel; the exiles from Babylon, as some; or rather such who in the times of the judges had been carried captive by their neighbours, or fled from their cities, in the times of Saul for fear of the Philistines, and who were gathered to their own country, cities, and houses, when David began to reign. Spiritually this regards the whole Israel of God, the elect of God, whether Jews or Gentiles, and the outcasts of them; so called, not because ever cast out or cast off by the Lord, being received into his favour, covenant, and church; but either because cast out of the company of profane men, as evil and unworthy; or cast out of Israel, the church of God, very justly, for offences given; but, being brought to repentance, are restored and gathered in again: or rather this may represent the Lord's people as in a state of nature, like the wretched infant cast out into the open field, scattered up and down in the world, in a state of distance from God, Christ, and his people; these are gathered by Christ in redemption, who came to seek and collect them together; and by his spirit in conversion, when he gathers them to himself, and into his fold; and this, as it is an occasion of joy to angels and saints, is matter of praise and thanksgiving to the outcasts themselves, thus gathered in. The Septuagint render it, to the dispersion or dispersed of Israel; see John 7:35.

(Compare Psalm 107:3; Isaiah 11:12).