Hebrews 12:21

And so terrible was the sight that.... — Better, And (so fearful was the appearance) Moses said, I exceedingly fear and tremble. Deuteronomy 9:19, as it stands in the Greek translation, contains these words in part (“I exceedingly fear”); there, however, they belong to a later time, when Moses was “afraid of the anger and hot displeasure” of the Lord against the worshippers of the golden calf (Exodus 32). Various Jewish traditions speak of the terror of Moses as upon Mount Sinai he beheld the wonders of the heavenly world (see Hebrews 2:2); but no saying that has been preserved throws additional light on the words before us.