Deuteronomy 4:11-15

11“Then you came near and stood at the foot of the mountain, and the mountain burned with fire to the midst of heaven, with darkness, cloud, and thick darkness.

12And the Lord spoke to you out of the midst of the fire. You heard the sound of the words, but saw no form; you only heard a voice.

13So He declared to you His covenant which He commanded you to perform, the Ten Commandments; and He wrote them on two tablets of stone.

14And the Lord commanded me at that time to teach you statutes and judgments, that you might observe them in the land which you cross over to possess.

15“Take careful heed to yourselves, for you saw no form when the Lord spoke to you at Horeb out of the midst of the fire,