Deuteronomy 4:12

“And the Lord spake unto you out of the midst of the fire, etc.] For the Lord descended on Mount Sinai in a cloud, in fire, and was in the thick darkness, from whence he delivered out the ten commands: ye heard the voice of the words; distinctly and plainly, not only the sound of them, but the words themselves, and so as to understand what was meant by them; but saw no similitude; not any likeness of the person speaking, by which they could form any idea of him in their minds, which was purposely done to prevent idolatry: only ye heard a voice; that was all.”

“ye heard the voice of the words, but saw no similitude--Although articulate sounds were heard emanating from the mount, no form or representation of the Divine Being who spoke was seen to indicate His nature or properties according to the notions of the heathen.”

“Hero worship exhibited itself in the practice of setting up images of human form as household gods (Penates, compare Genesis 31:19; Genesis 35:2), or as local and civic divinities: a practice forbidden by Deuteronomy 4:16. Nature worship in its baser shapes is seen in the Egyptian idolatry of animals and animal figures, and is condemned in Deuteronomy 4:17-18 : while its less ignoble flight, the worship of the sun, moon, and stars, is forbidden in Deuteronomy 4:19. The great legislator may be regarded as taking in the passage before us a complete and comprehensive survey of the various forms of idolatrous and corrupt worship practiced by the surrounding Oriental nations, and as particularly…”

“No similitude - No resemblance or representation of God, whereby either his essence, or properties, or actions were represented, such as were usual among the Heathens. Deuteronomy 4:14”

“the Lord: Deu 5:4, Deu 5:22 no similitude: Deu 4:15; Num 12:8; Isa 40:18; Col 1:15 only ye heard a voice: Heb. save a voice, Deu 4:33, Deu 4:36; Exo 20:22; Kg1 19:12, Kg1 19:13; Isa 30:21, Isa 40:3, Isa 40:6; Mat 3:3, Mat 3:17, Mat 17:5; Joh 12:28-30; Pe2 1:17, Pe2 1:18 Deuteronomy 4:13”