Exodus 20:18-20

Now all the people witnessed the thunder and the flashes of lightning and the sound of the trumpet and the smoking mountain; and as they looked, the people were afraid, and they trembled [and moved backward] and stood at a [safe] distance. Then they said to Moses, “You speak to us and we will listen, but do not let God speak to us or we will die.” Moses said to the people, “Do not be afraid; for God has come in order to test you, and in order that the fear of Him [that is, a profound reverence for Him] will remain with you, so that you do not sin.”