Hebrews 12:18-21

You have not come to a mountain which may be touched, and is burning with fire, and to a black cloud, and a dark smoke, and a violent wind, And to the sound of a horn, and the voice of words, the hearers of which made request that not a word more might be said to them: For the order which said, If the mountain is touched even by a beast, the beast is to be stoned, seemed hard to them; And the vision was so overpowering that even Moses said, I am shaking and full of fear.