Exodus 19:16-19 King James Version (KJV)
16 And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that was in the camp trembled.
17 And Moses brought forth the people out of the camp to meet with God; and they stood at the nether part of the mount.
18 And mount Sinai was altogether on a smoke, because the Lord descended upon it in fire: and the smoke thereof ascended as the smoke of a furnace, and the whole mount quaked greatly.
19 And when the voice of the trumpet sounded long, and waxed louder and louder, Moses spake, and God answered him by a voice.