Verse 3
The voice of the Lord - Thunder, so called, Exo 9:23, Exo 9:28, Exo 9:29; Job 37:4; Psa 18:13; Isa 30:30. On this subject see the note on Job 37:4, where there is a particular description of the nature and generation of thunder; and of the lightning, clap, rain, and other phenomena which accompany it.
Upon many waters - The clouds, which Moses calls the waters which are above the firmament.