Deuteronomy 4:10-13

10The day you stood before the Lord your God at Horeb, the Lord said to me, ‘Assemble the people before me, and I will let them hear my words, so that they may learn to fear me all the days they live on the earth and may instruct their children.’

11You came near and stood at the base of the mountain, a mountain blazing with fire into the heavens and enveloped in a totally black cloud.

12Then the Lord spoke to you from the fire. You kept hearing the sound of the words, but didn’t see a form; there was only a voice.

13He declared his covenant to you. He commanded you to follow the Ten Commandments, which he wrote on two stone tablets.