At your rebuke they fled; at the voice of your thunder they hastened away.
Read Chapter 104
Augustine of Hippo
AD 430
7. "From Thy rebuke they shall fly" (ver. 7). And this was done, brethren; from God's rebuke the waters did fly; that is, they went back from pressing on the mountains. Now the mountains themselves stand forth, Peter and Paul: how do they tower! They who before were pressed down by persecutors, now are venerated by emperors. For the waters are fled from the rebuke of God; because "the heart of kings is in the hand of God, He hath bent it whither He would;" He commanded peace to be given by them to the Christians; the authority of the Apostles sprang up and towered high. ...The waters fled from the rebuke of God. "From the voice of Thy thunder they shall be afraid." Now who is there that would not be afraid, from the voice of God through the Apostles, the voice of God through the Scriptures, through His clouds? The sea is quieted, the waters have been made afraid, the mountains have been laid bare, the emperor hath given the order. But who would have given the order, unless God had thun...
Fear. Hebrew, "retire precipitately "to their beds, at thy command, (Haydock) on the third day. (Calmet)
Some think that a storm or the deluge are here described, (St. Chrysostom) which is less probable. (Berthier) (Calmet)
The waters would naturally cover the earth; but are confined to their proper channels by God. (Worthington)