Psalms 87:1

His foundation Namely, the foundation of the city, or temple of God, of which he speaks in the following verses. The psalmist's thoughts, we may suppose, were strongly fixed upon the temple and city of God; he had them full in his view, and was contemplating the glories of them, and at length breaks out into this abrupt expression, which has a reference, though not to what he had written before, yet to what he had deeply thought of; nor was his meaning obscure to any one who knew what had been the subject of his meditation. Thus Dr. Horne: “The psalmist having meditated on the strength, the beauty, and the glory of the holy city, and imagining the thoughts of his hearers or readers to have been employed on the same subject, breaks forth at once in this abrupt manner.” Is in the holy mountains Hebrew, בהררי קדשׁ, beharree kodesh, the mountains of holiness; by which he means those mountains, or “hills of Judea, which God had chosen and separated to himself from all others, whereon to construct the highly-favoured city and temple, namely, mount Zion, mount Moriah, and other lesser hills. They are called holy mountains, or mountains of holiness, because the city and temple were, in a peculiar sense, consecrated to God, and because God in an especial manner dwelt therein, the ark of his presence being fixed there. The doctrines, and merits, and laws of Christ are those holy mountains on which his church, here typified by the city and temple of Jerusalem, is built; for it is built on Christ our Prophet, Priest, and King, and other foundation than this can no man lay. It is founded in and on holiness; Christ is a holy Prophet, a holy Priest, and a holy King; his doctrine, and merits and laws are all holy. And holiness is the strength and stability of his church; that, and that alone, will support it, and keep it from sinking: not so much,” says Henry, “that it is built upon mountains, as that it is built on holy mountains;” upon the word and promise of the holy God, for the confirming of which he hath sworn by his holiness; upon the mediation of his holy Son, who was manifested to take away our sins, and gave himself for his church, that he might sanctify and cleanse it; and upon the sanctifying influence of his holy Spirit and holy laws, all which, taken together, secure both the holiness and happiness of its members.