Exodus 19:18-20

MLV(i) 18 And Mount Sinai, the whole of it, smoked, because Jehovah descended upon it in fire and the smoke of it ascended as the smoke of a furnace. And the whole mountain quaked greatly.
19 And when the sound of the trumpet grew louder and louder, Moses spoke and God answered him by a voice. 20 And Jehovah came down upon Mount Sinai, to the top of the mountain. And Jehovah called Moses to the top of the mountain and Moses went up.