4. Thither the tribes ascended. David here invests Jerusalem with two titles of honor, calling it the sacred and regularly appointed place for calling upon the name of God; and next, the royal sea, to which the whole people were to have recourse for obtaining justice. All our salvation depends upon these two points; first, that Christ has been given to us to be our priest; and, secondly, that he has been established king to govern us. This God showed to his ancient people under figures. The sanctuary erected on mount Zion was intended to keep their faith fixed upon the spiritual priesthood of Christ; and in like manner, by the kingdom of David, there was presented to their view an image of the kingdom of Christ. The Psalmist, therefore, says in the first place, that the tribes or families of God shall come to Jerusalem; and then he immediately adds, that there the seat of judgment is erected, on which he and his posterity will sit. The reason why it was the will of God that there should be only one temple and one altar was, that the people might not fall away to various superstitions. David therefore here declares that this place was appointed by God's own mouth, that all the families of God, or the twelve tribes, might there assemble from all quarters. To express more plainly how important it was, for this form of God's worship to be preserved pure and complete, he says that it was for a testimony. The noun employed comes from the verb dwe, ud, which signifies to bear witness, or to covenant. Now by the word in this place is denoted a mutual declaration or agreement between God and the people. When the tribes shall come thither, says the Prophet substantially, it will not be at random, because their fancy thus leads them, but because God by his own mouth invites them. The amount therefore is, that the holy assemblies which shall be kept at Jerusalem will not be vain and unprofitable, since God has made a covenant with his people, determining and appointing that place for his service. Whence we learn, that in judging of the true temple of God, it is necessary to take into account the doctrine taught. With respect to the time in which David lived, as God had adopted the Jewish people, and as it was his will that they should be employed in the external worship of his name, he prescribed to them a rule from which it was unlawful for them to deviate. Thus when the faithful assembled on mount Zion, it was not foolishness or inconsiderate zeal, or the impulse of their own minds, which brought them thither, as if they resembled those men whom we daily see inventing for themselves, out of their own heads, numberless kinds of divine worship; but they were led thither by the command of God, that they might worship him on mount Zion, by which word the Prophet intimates, that all other temples are unholy, and all other religions perverse and corrupt, because they do not correspond with the rule laid down in God's word. He next subjoins the end of this contract or covenant, which was that the name of God might be praised. And, indeed, as to yield to God the glory of all good things is the end of our adoption, so it is the end of all our actions.

5. For there were set thrones for judgment. He means, that the throne of the kingdom was fixed or established at Jerusalem, or that there it had its permanent seat. Among that people some order of judgments had always existed. these, however, had formerly been in an unsettled state, and frequently changed, but God at length ordained, in the person of David, a new government which should flow in a continual course; for it was his will that the children of David should succeed their father in this royal dignity from age to age until the coming of Christ. The Prophet has a little before spoken of the Temple and the priesthood; and now he affirms, that this kingdom, which God had erected, will be firm and stable; in order to distinguish it from all the other kingdoms of the world, which are not only temporary, but also frail and subject to a variety of changes. This everlastingness of the kingdom has been expressly confirmed by other Prophets in various parts of their' writings, and not without cause; for the object was, to teach the faithful that God would be the guardian of their welfare only upon the supposition of their remaining under the protection and defense of David, and that, therefore, if they desired to continue in safety and to prosper, they should not make for themselves new kings at their own pleasure, but should live quietly under that kind of government which God had set up among them. The repetition of the word throne is emphatic. There, says the Psalmist, the throne of judgment and equity is erected. Then he adds, the throne of the house of David; for it was the will of God that the right and prerogative of reigning should continue in David's posterity, until the true everlastingness of this kingdom should be manifested in the person of Christ.