Deuteronomy 4:11-15

11You came near and stood at the foot of the mountain, 1and the mountain burned with fire to the very heart of the heavens: darkness, cloud and thick gloom. 12Then the Lord spoke to you from the midst of the fire; you heard the sound of words, but you saw no form--only a voice. 13So He declared to you His covenant which He commanded you to perform, that is, 2the Ten 3Commandments; and 4He wrote them on two tablets of stone. 14The Lord commanded me at that time to teach you statutes and judgments, that you might perform them in the land where you are going over to possess it.

15“So 5watch yourselves carefully, since you did not see any 6form on the day the Lord spoke to you at Horeb from the midst of the fire,