Exodus 19:18-21

18And the whole of mount Sinai smoked, because Jehovah descended on it in fire; and its smoke ascended as the smoke of a furnace; and the whole mountain shook greatly.

19And the sound of the trumpet increased and became exceeding loud; Moses spoke, and 1God answered him by a voice.

20And Jehovah came down on mount Sinai, on the top of the mountain; and Jehovah called Moses to the top of the mountain, and Moses went up.

21And Jehovah said to Moses, Go down, testify to the people that they break not through to Jehovah to gaze, and many of them perish.