Deuteronomy 4:11-14

You came near and stood at the foot of the mountain, and the mountain burned with fire to the very heart of the heavens: darkness, cloud and thick gloom. Then 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. So He declared to you His covenant which He commanded you to perform, that is, the Ten Commandments; and He wrote them on two tablets of stone. The 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.