Exodus 20:18-20

And all the people saw the voices and the flames, and the sound of the trumpet, and the mount smoking; and being terrified and struck with fear, they stood afar off,

Saying to Moses: Speak thou to us, and we will hear: let not the Lord speak to us, lest we die.

And Moses said to the people: Fear not; for God is come to prove you, and that the dread of him might be in you, and you should not sin.