Deuteronomy 4:11-13

Young's Literal Translation

¹¹ and ye draw near and stand under the mountain, and the mountain is burning with fire unto the heart of the heavens -- darkness, cloud, yea, thick darkness:

¹² `And Jehovah speaketh unto you out of the midst of the fire; a voice of words ye are hearing and a similitude ye are not seeing, only a voice;

¹³ and He declareth to you His covenant, which He hath commanded you to do, the Ten Matters, and He writeth them upon two tables of stone.