“And the people saw it” (Exod. 20-15). What did they see? They saw the great Glory (kavod gadol). R. Eliezer said- Whence do we know that the Israelite maidservant saw that which the greatest of prophets did not see? It is written, “And the people saw it.” What did they see? They saw the great Glory.
Translated by Elliot Wolfson in Through a Speculum that Shines- Vision and Imagination in Medieval Jewish Mysticism, Princeton- Princeton University Press, 1994.