Exodus 20:18-21

When the people heard the thunder and the loud blast of the ram’s horn, and when they saw the flashes of lightning and the smoke billowing from the mountain, they stood at a distance, trembling with fear. And they said to Moses, “You speak to us, and we will listen. But don’t let God speak directly to us, or we will die!” “Don’t be afraid,” Moses answered them, “for God has come in this way to test you, and so that your fear of him will keep you from sinning!” As the people stood in the distance, Moses approached the dark cloud where God was.