Deuteronomy 4:10-11

4:10 You stood before the Lord your God at Horeb and he said to me, “Assemble the people before me so that I can tell them my commands. Then they will learn to revere me all the days they live in the land, and they will instruct their children.” 4:11 You approached and stood at the foot of the mountain, a mountain ablaze to the sky above it and yet dark with a thick cloud.