Thou coveredst it with the deep, &c.— That is, at the first creation, the earth, while yet without form, was covered all over, and, as it were, clothed with the great deep; that vast expansion of air and waters; and those which are now the highest mountains, were then all under that liquid element. He adds, Psalms 104:7. At thy rebuke they fled; they, namely, the inferior waters, (see Genesis 1:9.) which were all gathered together into one place: At thy rebuke, i.e. at the powerful command of God; which, as it were, rebuked, and thereby corrected and regulated, that indigested confusion of things. At the voice of thy thunder, means, "Thy powerful voice, which resounded like thunder."
Related Commentaries of Psalms 104:6
Psalms 104:6
6 Thou coveredst it with the deep as with a garment: the waters stood above the mountains.