Psalms 97:6

6The heavens have declared his righteousness Here he states that there would be such an illustrious display of the righteousness of God, that the heavens themselves would herald it. The meaning is not the same as in the beginning of the nineteenth psalm, “The heavens declare the glory of God,” etc. In that psalm David means no more than that the wisdom and power of God are as conspicuous in the fabric of the heavens, as if God should assert them with an audible voice. The meaning of the passage before us is, that the spiritual righteousness of God should be so signally manifested under the reign of Christ as to fill both heaven and earth. There is much force in this personification, in which the heavens, as if even they were penetrated with a sense of the righteousness of God, are represented as speaking of it. It is equally probable, however, that the heavens signify here the angels, who are contained in heaven, by the figure of metonomy or synecdoche, while, in the corresponding clause, instead of the earth being mentioned, he speaks of the peoples who dwell upon it. The angels may very properly be said to announce and celebrate the Divine glory.