Psalms 89:37

“It shall be established for ever as the moon, etc.] Either Christ’s seed, or throne, which comes to much the same sense; for by both are meant his church and people, his kingdom and interest in the world; the moon is as perpetual as the sun, and is used as elsewhere to signify the continuance of the people, church, and interest of Christ, (<197205>Psalm 72:5,7), for though the moon has its spots, and is changeable, sometimes in the full, and sometimes in the decline, yet always is, and always continues, and ever will; and so though the people of God have their spots and imperfections, and are sometimes on the decline in the frames and dispositions of their minds, in the exercise of grace, in…”

“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 Psalms 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…”

“A witness - The rainbow, which is God's faithful witness, a token of God's everlasting covenant between God and every living creature for perpetual generations, Gen 9:12, Gen 9:16. Psalms 89:38”

“It shall: That is, as long as the sun and moon shall endure, as long as time shall last, his kingdom shall continue among men. The moon is probably termed a faithful witness, 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 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. Or, the rainbow may be intended; that faithful sign which God has established in the clouds, that the earth shall no more be destroyed by water. ever: Psa 72:7, Psa 104:19; Gen 1:14-18; Jer 31:35, Jer 31:36 and…”