Psalms 89:37

Then--when the covenant was established, of whose execution the exalted views of God now given furnish assurance. thou . . . to thy holy one--or godly saint, object of favor (Ps 4:3). Nathan is meant (2Sa 7:17; 1Ch 17:3-15). laid help--literally, "given help." David was chosen and then exalted.

This relation is perpetual with David's descendants, as a whole typical in official position of his last greatest descendant. Hence though in personal relations any of them might be faithless and so punished, their typical relation shall continue. His oath confirms His promise, and the most enduring objects of earth and heaven illustrate its perpetual force (Ps 72:5, 7, 17).

It shall be established for ever as the moon. The kingdom may wax and wane to mortal eyes, but it shall still abide as long as the moon walks in her silver beauty. And as a faithful witness in heavens. The most stable part of the universe is selected as a type of Messiah's kingdom, and both sun and moon are made to be symbols of its long endurance. Whatever else there is in the sky which faithfully witnesses to the unbending course of nature is also called upon to be a sign of the Lord's truth. When heaven and earth witness, and the Lord himself swears, there remains no excuse for doubting, and faith joyfully reposes in confident expectation.

As the moon, and as a faithful witness in heaven - That is, as long as the sun and moon shall endure, as long as time shall last, his kingdom shall last among men. The moon appears to be termed a faithful witness here, because by her particularly time is measured. Her decrease and increase are especially observed by every nation, and by these time is generally estimated, especially among the eastern nations. So many moons is a man old; so many moons since such an event happened; and even their years are reckoned by lunations. This is the case with the Mohammedans to the present day. Or the rainbow may be intended; that sign which God has established in the cloud; that faithful witness of his that the earth shall no more be destroyed by water. As long therefore as the sun, the moon, and the rainbow appear in the heavens, so long shall the spiritual David reign, and his seed prosper and increase. Selah - It is confirmed; it shall not fail.

It shall be established forever as the moon - As long as the moon shall endure. The heavenly bodies are the most permanent objects that we know of; and they, therefore, became the emblems of stability and perpetuity. Compare the notes at Psa 72:7. And as a faithful witness in heaven - As the witness in heaven, or in the sky, is sure. The reference is to the moon, regarded as a witness for God. What is said here of the moon as an index of his faithfulness, might be said also of the sun and the stars; but the beauty of the image is increased by the attention being fixed to a single object. As the moon is fixed, regular, enduring - so are the promises and purposes of God. Such were the promises made to David; such was the oath which had been taken by God; such the covenant which he had made. The psalmist now proceeds Psa 89:38-45 to show that this oath and these promises seemed to be disregarded; that there were things occurring which appeared as if God had forgotten them; that there was not that manifest prosperity and favor which was implied in the promise; but that a series of calamities had occurred which it was difficult to reconcile with these solemn pledges. On the ground of this he prays Psa 89:46-52 that God would return, and would remember his covenant, and would bless David and his people.