The voice of the LORD is upon the waters: the God of glory thunders: the LORD is upon many waters.
Read Chapter 29
Augustine of Hippo
3. "The Voice of the Lord is upon the waters" (ver. 3). The Voice of Christ is upon the people. "The God of majesty hath thundered." The God of majesty, from the cloud of the flesh, hath awfully preached repentance. "The Lord is upon many waters." The Lord Jesus Himself, after that He sent forth His Voice upon the people, and so.
Voice. Separating the waters from the earth at the beginning, as the six other voices may denote the other works of the creation; or all these voices may signify the various effects of thunder, or may allude to the terrors preceding the last judgment, (Apocalypse x. 3.) or attending the establishment and liberation of the Jewish and Christian Churches. The first voice was heard when Jesus was baptized, (Matthew iii. 17.) as the rest may intimate the instruction and efficacy of the other sacraments. It is evident that something posterior to the reign of David is prefigured; (Berthier) and the Fathers have generally understood the psalm of the propagation of the gospel by the apostles, two of whom are styled sons of thunder, Mark iii. 17. (Calmet)
The psalmist speaks of greater things than attended the translation of the ark. He represents our Saviour preaching with great power and majesty, (Matthew vii. 29.) and subjecting the most powerful monarchs to his dominion. (Worthington)