This they speak from a sense of their own guilt, and of the greatness and holiness of the Divine Majesty, to whom they durst not approach but by a mediator. See Deuteronomy 5:27, Deuteronomy 18:16 Galatians 3:19.
Related Commentaries of Exodus 20:19
Exodus 20:19
19 And they said unto Moses, Speak thou with us, and we will hear: but let not God speak with us, lest we die.