At thy rebuke they fled; at the voice of thy thunder they hasted away.
At thy rebuke they fled. The water was removed from off the earth on the third day of creation. The deep stood, as it were, in an attitude of opposition to God's will, that His glory, as the God of order, should be manifested in the orderly distribution of the elements of this beautiful earth. God, by a rebuke, compels them to recede into their own place (Genesis 1:9), just as Jesus "rebuked the wind, and said unto the sea, Peace, be still" (Mark 4:39).
At the voice of thy thunder - i:e., thy thunder-like voice.
They hasted away - for fear.