English: “For you saw no likeness” — to teach you that the Torah was not given by means of any image or form, but out of the fire without the seeing of any likeness.
In context: The verse is the foundation of the absolute prohibition of representing the Divine. The revelation itself contained no visual content that could later be turned into an idol.
Type of Learning
Custom (negative implication from the absence of temunah).
What Is Learned
Because Israel saw no form at Sinai, no image of the Divine may ever be made; the revelation was purely auditory and fiery.