Exodus 19:18-21

18Smoke covered Sinai mountain because the Lord had come down on the mountain, like a fire. The smoke rose up from the mountain, like smoke from a great fire. The whole mountain shook very much.

19The noise of the trumpet became louder and louder. Moses spoke to God and God answered him with a loud voice.

20The Lord came down onto the top of Sinai mountain. Then the Lord told Moses that he must come up to the top of the mountain. So Moses went up the mountain.

21The Lord said to Moses, ‘Go down to the people. Warn them that they must stay away from the mountain. They must not cross the line to try to see me, the Lord. If they do that, many of them will die.