Exodus 19:16-22

16And it came to pass on the third day, when it was morning, that there were thunders and lightnings and a heavy cloud on the mountain, and the sound of the trumpet exceeding loud; and the whole people that was in the camp trembled.

17And Moses brought the people out of the camp to meet with 1God; and they stood at the foot of the mountain.

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 2God 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.

22And the priests also, who come near to Jehovah, shall hallow themselves, lest Jehovah break forth on them.