Exodus 19:18-20

ERV(i) 18 And mount Sinai was altogether on 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 waxed louder and louder, Moses spake, and God answered him by a voice. 20 And the LORD came down upon mount Sinai, to the top of the mount: and the LORD called Moses to the top of the mount; and Moses went up.