Hebrews 12:18-21

You have not come to a mountain that can be touched and that is burning with fire; to darkness, gloom and storm; to a trumpet blast or to such a voice speaking words that those who heard it begged that no further word be spoken to them, because they could not bear what was commanded: “If even an animal touches the mountain, it must be stoned to death.” The sight was so terrifying that Moses said, “I am trembling with fear.”