Exodus 20:18-21

Now all the people witnessed the thunderings, the lightning flashes, the sound of the trumpet, and the mountain smoking; and when the people saw it, they trembled and stood afar off. Then they said to Moses, “You speak with us, and we will hear; but let not God speak with us, lest we die.” And Moses said to the people, “Do not fear; for God has come to test you, and that His fear may be before you, so that you may not sin.” So the people stood afar off, but Moses drew near the thick darkness where God was.