Exodus 19:16-19
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16So it came about on the third day, when it was morning, that there were thunder and lightning flashes and a thick cloud over the mountain and a very loud trumpet sound, so that all the people who were in the camp trembled. 17And Moses brought the people out of the camp to meet God, and they stood at the foot of the mountain.
18Now Mount Sinai was all in smoke because the Lord descended upon it in fire; and its smoke ascended like the smoke of a furnace, and the entire mountain quaked violently. 19When the sound of the trumpet grew louder and louder, Moses spoke, and God answered him with thunder.